Tuesday, 23 October 2012
c# for dummies: c sharp classes
c# for dummies: c sharp classes: Cannot insert null value Step 1: Open the sql server studio Step 2: open the table in particular i.e unionTB Step3: ...
c sharp classes
Step 1:
Open the sql server studio
Step 2:
open the table in particular i.e unionTB
Step3:
Tick the column affected allow null
see the pictures.
c# for dummies: c sharp programming
c# for dummies: c sharp programming: Step1: If you are using class go to the class open it Step2: delete the database linq to sql classes and re add them. i.e ...
c sharp programming
If you are using class go to the class open it
Step2:
delete the database linq to sql classes and re add them. i.e munedb.dml
see pictures
Tuesday, 16 October 2012
c# for dummies: c sharp programming
c# for dummies: c sharp programming: // BY THE SPIRIT THE CREATOR OF THE WHOLE WORLD using System; using System.Collections.Generic; using System.ComponentModel; using Syste...
c sharp programming
// BY THE SPIRIT THE CREATOR OF THE WHOLE WORLD
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace testingFormuneDB
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
SqlConnection sqconnection;
SqlCommand sqlcommand;
string connectionstring = @"Data Source=.\SQLEXPRESS;AttachDbFilename=c:\users\abayomi\documents\visual studio 2010\Projects\testingFormuneDB\testingFormuneDB\testingMUNEProjDB.mdf;Integrated Security=True;User Instance=True";
bool flag = false;
private void btnsubmit_Click(object sender, EventArgs e)
{
bool resp= saveTotalbalance();
MessageBox.Show(resp.ToString());
}
public bool saveTotalbalance()
{
int mandatory = int.Parse(txtboxmandatory.Text);
int voluntary = int.Parse(txtboxvoluntary.Text);
int prevoiusbalance = int.Parse(txtboxpreviousbalance.Text);
int totalbalance = mandatory + voluntary + prevoiusbalance;
txtboxtotalbalance.Text = totalbalance.ToString();
sqconnection = new SqlConnection(connectionstring);
sqconnection.Open();
string commanntxt = "insert into repaymentTB (totalbalance) values('" + totalbalance + "') ";
sqlcommand = new SqlCommand(commanntxt, sqconnection);
sqlcommand.ExecuteNonQuery();
flag = true;
return flag;
}
public void retrivebalance()
{
sqconnection = new SqlConnection(connectionstring);
sqconnection.Open();
string commandtxt = "select totalbalance from repaymentTB ";
sqlcommand = new SqlCommand(commandtxt, sqconnection);
DataTable dt = new DataTable();
DataSet ds = new DataSet();
SqlDataAdapter sqldatadapter = new SqlDataAdapter(sqlcommand);
sqldatadapter.Fill(ds);
dt = ds.Tables[0];
foreach (DataRow r in dt.Rows)
{
lblpreviousbalance.Text = r["totalbalance"].ToString();
}
sqconnection.Close();
}
private void Form1_Load(object sender, EventArgs e)
{
retrivebalance();
}
}
}
c# for dummies: c sharp classes
c# for dummies: c sharp classes: USING LINQ TO SQL: nwind.Northwind db = new nwind.Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); db.Log = Console.Out;...
c sharp classes
USING LINQ TO SQL:
nwind.Northwind db =
new nwind.Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind");
db.Log = Console.Out;
var custs = from c in db.Customers
where c.Region == "WA"
select new { Id = c.CustomerID, Name = c.ContactName };
foreach (var cust in custs)
{
Console.WriteLine("{0} - {1}", cust.Id, cust.Name);
}
nwind.Northwind db =
new nwind.Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind");
db.Log = Console.Out;
var custs = from c in db.Customers
where c.Region == "WA"
select new { Id = c.CustomerID, Name = c.ContactName };
foreach (var cust in custs)
{
Console.WriteLine("{0} - {1}", cust.Id, cust.Name);
}
c# for dummies: c sharp classes
c# for dummies: c sharp classes: how to use expression trees int[] nums = new int[] { 6, 2, 7, 1, 9, 3 }; IEnumerable numsLessThanFour = nums .Where(i => i < 4) .Or...
c sharp classes
how to use expression trees
int[] nums = new int[] { 6, 2, 7, 1, 9, 3 };
IEnumerable<int> numsLessThanFour = nums
.Where(i => i < 4)
.OrderBy(i => i);
int[] nums = new int[] { 6, 2, 7, 1, 9, 3 };
IEnumerable<int> numsLessThanFour = nums
.Where(i => i < 4)
.OrderBy(i => i);
c# for dummies: c sharp programming
c# for dummies: c sharp programming: How To Use Lambda Expressions int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int[] oddNums = Common.FilterArrayOfInts(nums, i => ((i & 1) ...
c sharp programming
How To Use Lambda Expressions
int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int[] oddNums = Common.FilterArrayOfInts(nums, i => ((i & 1) == 1));
foreach (int i in oddNums)
Console.WriteLine(i);
1
3
5
7
9
int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int[] oddNums = Common.FilterArrayOfInts(nums, i => ((i & 1) == 1));
foreach (int i in oddNums)
Console.WriteLine(i);
1
3
5
7
9
c# for dummies: c sharp classes
c# for dummies: c sharp classes: How to Use the DataContext Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); db.Log = Console.Out; IQuery...
c sharp classes
How to Use the DataContext
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
db.Log = Console.Out;
IQueryable<Order> orders = from c in db.Customers
from o in c.Orders
where c.Country == "USA" && c.Region == "WA"
select o;
foreach(Order item in orders)
Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID,
item.ShipName);
OUTPUT:
SELECT [t1].[OrderID], [t1].[CustomerID], [t1].[EmployeeID], [t1].[OrderDate],
[t1].[RequiredDate], [t1].[ShippedDate], [t1].[ShipVia], [t1].[Freight],
[t1].[ShipName], [t1].[ShipAddress], [t1].[ShipCity], [t1].[ShipRegion],
[t1].[ShipPostalCode], [t1].[ShipCountry]
FROM [dbo].[Customers] AS [t0], [dbo].[Orders] AS [t1]
WHERE ([t0].[Country] = @p0) AND ([t0].[Region] = @p1) AND ([t1].[CustomerID] =
[t0].[CustomerID])
-- @p0: Input String (Size = 3; Prec = 0; Scale = 0) [USA]
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
db.Log = Console.Out;
IQueryable<Order> orders = from c in db.Customers
from o in c.Orders
where c.Country == "USA" && c.Region == "WA"
select o;
foreach(Order item in orders)
Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID,
item.ShipName);
OUTPUT:
SELECT [t1].[OrderID], [t1].[CustomerID], [t1].[EmployeeID], [t1].[OrderDate],
[t1].[RequiredDate], [t1].[ShippedDate], [t1].[ShipVia], [t1].[Freight],
[t1].[ShipName], [t1].[ShipAddress], [t1].[ShipCity], [t1].[ShipRegion],
[t1].[ShipPostalCode], [t1].[ShipCountry]
FROM [dbo].[Customers] AS [t0], [dbo].[Orders] AS [t1]
WHERE ([t0].[Country] = @p0) AND ([t0].[Region] = @p1) AND ([t1].[CustomerID] =
[t0].[CustomerID])
-- @p0: Input String (Size = 3; Prec = 0; Scale = 0) [USA]
c# for dummies: c sharp programming
c# for dummies: c sharp programming: Using the Cast: ArrayList arrayList = new ArrayList(); arrayList.Add("Adams"); arrayList.Add("Arthur"); arrayList.Add("Buchanan"); IEnumerab...
c sharp programming
Using the Cast:
ArrayList arrayList = new ArrayList();
arrayList.Add("Adams");
arrayList.Add("Arthur");
arrayList.Add("Buchanan");
IEnumerable<string> names = arrayList.Cast<string>().Where(n => n.Length < 7);
foreach(string name in names)
Console.WriteLine(name);
ArrayList arrayList = new ArrayList();
arrayList.Add("Adams");
arrayList.Add("Arthur");
arrayList.Add("Buchanan");
IEnumerable<string> names = arrayList.OfType<string>().Where(n => n.Length < 7);
foreach(string name in names)
Console.WriteLine(name);
OUTPUT:
Adams
Arthur
ArrayList arrayList = new ArrayList();
arrayList.Add("Adams");
arrayList.Add("Arthur");
arrayList.Add("Buchanan");
IEnumerable<string> names = arrayList.Cast<string>().Where(n => n.Length < 7);
foreach(string name in names)
Console.WriteLine(name);
ArrayList arrayList = new ArrayList();
arrayList.Add("Adams");
arrayList.Add("Arthur");
arrayList.Add("Buchanan");
IEnumerable<string> names = arrayList.OfType<string>().Where(n => n.Length < 7);
foreach(string name in names)
Console.WriteLine(name);
OUTPUT:
Adams
Arthur
c# for dummies: c sharp classes
c# for dummies: c sharp classes: Using the var Keyword Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); IEnumerable orders = db.Cu...
c sharp classes
Using the var Keyword
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
IEnumerable<Order> orders = db.Customers
.Where(c => c.Country == "USA" && c.Region == "WA")
.SelectMany(c => c.Orders);
foreach(Order item in orders)
Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID,
item.ShipName);
OUTPUT:
3/21/1997 12:00:00 AM - 10482 - Lazy K Kountry Store
5/22/1997 12:00:00 AM - 10545 - Lazy K Kountry Store
…
4/17/1998 12:00:00 AM - 11032 - White Clover Markets
5/1/1998 12:00:00 AM - 11066 - White Clover Markets
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
IEnumerable<Order> orders = db.Customers
.Where(c => c.Country == "USA" && c.Region == "WA")
.SelectMany(c => c.Orders);
foreach(Order item in orders)
Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID,
item.ShipName);
OUTPUT:
3/21/1997 12:00:00 AM - 10482 - Lazy K Kountry Store
5/22/1997 12:00:00 AM - 10545 - Lazy K Kountry Store
…
4/17/1998 12:00:00 AM - 11032 - White Clover Markets
5/1/1998 12:00:00 AM - 11066 - White Clover Markets
Saturday, 13 October 2012
c sharp programming
Using the var Keyword
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
IEnumerable<Order> orders = db.Customers
.Where(c => c.Country == "USA" && c.Region == "WA")
.SelectMany(c => c.Orders);
foreach(Order item in orders)
Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID,
item.ShipName);
OUTPUT:
3/21/1997 12:00:00 AM - 10482 - Lazy K Kountry Store
5/22/1997 12:00:00 AM - 10545 - Lazy K Kountry Store
…
4/17/1998 12:00:00 AM - 11032 - White Clover Markets
5/1/1998 12:00:00 AM - 11066 - White Clover Markets
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
IEnumerable<Order> orders = db.Customers
.Where(c => c.Country == "USA" && c.Region == "WA")
.SelectMany(c => c.Orders);
foreach(Order item in orders)
Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID,
item.ShipName);
OUTPUT:
3/21/1997 12:00:00 AM - 10482 - Lazy K Kountry Store
5/22/1997 12:00:00 AM - 10545 - Lazy K Kountry Store
…
4/17/1998 12:00:00 AM - 11032 - White Clover Markets
5/1/1998 12:00:00 AM - 11066 - White Clover Markets
c# for dummies: c sharp classes
c# for dummies: c sharp classes: USING LINQ namespace LINQDev.HR { public class Employee { public int id; public string firstName; public string lastName; ...
c sharp classes
USING LINQ
namespace LINQDev.HR
{
public class Employee
{
public int id;
public string firstName;
public string lastName;
public static ArrayList GetEmployees()
{
// Of course the real code would probably be making a database query
// right about here.
ArrayList al = new ArrayList();
// Man, do the C# object initialization features make this a snap.
al.Add(new Employee { id = 1, firstName = "Joe", lastName = "Rattz"} );
al.Add(new Employee { id = 2, firstName = "William", lastName = "Gates"} );
al.Add(new Employee { id = 3, firstName = "Anders", lastName = "Hejlsberg"}
);
return(al);
}
}
}
namespace LINQDev.Common
{
public class Contact
{
public int Id;
public string Name;
public static void PublishContacts(Contact[] contacts)
{
// This publish method just writes them to the console window.
foreach(Contact c in contacts)
Console.WriteLine("Contact Id: {0} Contact: {1}", c.Id, c.Name);
}
}
}
\
LINQDev.Common.Contact[] contacts = alEmployees
.Cast<LINQDev.HR.Employee>()
.Select(e => new LINQDev.Common.Contact {
Id = e.id,
Name = string.Format("{0} {1}", e.firstName, e.lastName)
})
.ToArray<LINQDev.Common.Contact>();
LINQDev.Common.Contact.PublishContacts(contacts);
OUTPUT:
Contact Id: 1 Contact: Joe Rattz
Contact Id: 2 Contact: William Gates
Contact Id: 3 Contact: Anders Hejlsberg
namespace LINQDev.HR
{
public class Employee
{
public int id;
public string firstName;
public string lastName;
public static ArrayList GetEmployees()
{
// Of course the real code would probably be making a database query
// right about here.
ArrayList al = new ArrayList();
// Man, do the C# object initialization features make this a snap.
al.Add(new Employee { id = 1, firstName = "Joe", lastName = "Rattz"} );
al.Add(new Employee { id = 2, firstName = "William", lastName = "Gates"} );
al.Add(new Employee { id = 3, firstName = "Anders", lastName = "Hejlsberg"}
);
return(al);
}
}
}
namespace LINQDev.Common
{
public class Contact
{
public int Id;
public string Name;
public static void PublishContacts(Contact[] contacts)
{
// This publish method just writes them to the console window.
foreach(Contact c in contacts)
Console.WriteLine("Contact Id: {0} Contact: {1}", c.Id, c.Name);
}
}
}
\
LINQDev.Common.Contact[] contacts = alEmployees
.Cast<LINQDev.HR.Employee>()
.Select(e => new LINQDev.Common.Contact {
Id = e.id,
Name = string.Format("{0} {1}", e.firstName, e.lastName)
})
.ToArray<LINQDev.Common.Contact>();
LINQDev.Common.Contact.PublishContacts(contacts);
OUTPUT:
Contact Id: 1 Contact: Joe Rattz
Contact Id: 2 Contact: William Gates
Contact Id: 3 Contact: Anders Hejlsberg
c# for dummies: c sharp programming
c# for dummies: c sharp programming: HOW TO QUERY LINQ TO SQL DATABASE using System; using System.Linq; using System.Data.Linq; using nwind; Northwind db = new Northwind(@"Data ...
c sharp programming
HOW TO QUERY LINQ TO SQL DATABASE
using System;
using System.Linq;
using System.Data.Linq;
using nwind;
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
var custs =
from c in db.Customers
where c.City == "Rio de Janeiro"
select c;
foreach (var cust in custs)
Console.WriteLine("{0}", cust.CompanyName);
using System;
using System.Linq;
using System.Data.Linq;
using nwind;
Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial
Catalog=Northwind");
var custs =
from c in db.Customers
where c.City == "Rio de Janeiro"
select c;
foreach (var cust in custs)
Console.WriteLine("{0}", cust.CompanyName);
c# for dummies: c sharp classes
c# for dummies: c sharp classes: HOW TO QUERY XML USING LINQ using System; using System.Linq; using System.Xml.Linq; XElement books = XElement.Parse( @" <boo...
c sharp classes
HOW TO QUERY XML USING LINQ
using System;
using System.Linq;
using System.Xml.Linq;
XElement books = XElement.Parse(
@"<books>
<book>
<title>Pro LINQ: Language Integrated Query in C# 2010</title>
<author>Joe Rattz</author>
</book>
<book>
<title>Pro .NET 4.0 Parallel Programming in C#</title>
<author>Adam Freeman</author>
</book>
<book>
<title>Pro VB 2010 and the .NET 4.0 Platform</title>
<author>Andrew Troelsen</author>
</book>
</books>");
var titles =
from book in books.Elements("book")
where (string) book.Element("author") == "Joe Rattz"
select book.Element("title");
foreach(var title in titles)
Console.WriteLine(title.Value);
using System;
using System.Linq;
using System.Xml.Linq;
XElement books = XElement.Parse(
@"<books>
<book>
<title>Pro LINQ: Language Integrated Query in C# 2010</title>
<author>Joe Rattz</author>
</book>
<book>
<title>Pro .NET 4.0 Parallel Programming in C#</title>
<author>Adam Freeman</author>
</book>
<book>
<title>Pro VB 2010 and the .NET 4.0 Platform</title>
<author>Andrew Troelsen</author>
</book>
</books>");
var titles =
from book in books.Elements("book")
where (string) book.Element("author") == "Joe Rattz"
select book.Element("title");
foreach(var title in titles)
Console.WriteLine(title.Value);
c# for dummies: c sharp programming
c# for dummies: c sharp programming: how to use linq using System; using System.Linq; string[] greetings = {"hello world", "hello LINQ", "hello Apress"}; var items = fr...
c sharp programming
how to use linq
using System;
using System.Linq;
string[] greetings = {"hello world", "hello LINQ", "hello Apress"};
var items =
from s in greetings
where s.EndsWith("LINQ")
select s;
foreach (var item in items)
Console.WriteLine(item);
using System;
using System.Linq;
string[] greetings = {"hello world", "hello LINQ", "hello Apress"};
var items =
from s in greetings
where s.EndsWith("LINQ")
select s;
foreach (var item in items)
Console.WriteLine(item);
Thursday, 4 October 2012
c# for dummies: C# video tutorials
c# for dummies: C# video tutorials: How to create C# solutions and Projects
Tuesday, 2 October 2012
c# for dummies: Inserting into database using WCF
Insert into Database using WCF.
Write These Code : App_Code/Service.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Data;
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service" in code, svc and config file together.
public class Service : IService
{
bool flag = false;
public bool saveStudent(string matricno,string name)
{
string conectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Abayomi\Documents\Visual Studio 2010\WebSites\UnderstandingWCF2\App_Data\studentDB.mdf;Integrated Security=True;User Instance=True";
SqlConnection sqlconn = new SqlConnection(conectionString);
sqlconn.Open();
string command = "insert into studentTB(MatricNo,name)values('"+matricno+"','"+name+"')";
SqlCommand sqlcooma = new SqlCommand(command, sqlconn);
sqlcooma.ExecuteNonQuery();
flag = true;
return flag;
}
}
}
Write these code in Interface: App_Code/IService.cs
public interface IService
{
[OperationContract]
bool saveStudent(string matricno,string name);
}
Then create another windows application
Go to add service refrence on the project solution explorer and enter the wcf address url.
Write These Code : App_Code/Service.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Data;
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service" in code, svc and config file together.
public class Service : IService
{
bool flag = false;
public bool saveStudent(string matricno,string name)
{
string conectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Abayomi\Documents\Visual Studio 2010\WebSites\UnderstandingWCF2\App_Data\studentDB.mdf;Integrated Security=True;User Instance=True";
SqlConnection sqlconn = new SqlConnection(conectionString);
sqlconn.Open();
string command = "insert into studentTB(MatricNo,name)values('"+matricno+"','"+name+"')";
SqlCommand sqlcooma = new SqlCommand(command, sqlconn);
sqlcooma.ExecuteNonQuery();
flag = true;
return flag;
}
}
}
Write these code in Interface: App_Code/IService.cs
public interface IService
{
[OperationContract]
bool saveStudent(string matricno,string name);
}
Then create another windows application
Go to add service refrence on the project solution explorer and enter the wcf address url.
Adding to columns together to produce a new column
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnload_Click(object sender, EventArgs e)
{
string constring = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Abayomi\Documents\Visual Studio 2010\WebSites\calculatedcolumns2\App_Data\product.mdf;Integrated Security=True;User Instance=True";
SqlConnection conn = new SqlConnection(constring);
string sqlcat = "select categoryID,categoryName from CategoriesTB";
string sqlprod = "select productName,categoryID,UnitPrice from productsTB";
SqlDataAdapter da = new SqlDataAdapter(sqlcat, conn);
DataSet ds = new DataSet();
conn.Open();
da.Fill(ds, "CategoriesTB");
da.SelectCommand.CommandText = sqlprod;
da.Fill(ds, "productsTB");
conn.Close();
// Define the realationships between Categories and Products
DataRelation relat = new DataRelation("CatProds", ds.Tables["CategoriesTB"].Columns["categoryID"], ds.Tables["productsTB"].Columns["categoryID"]);
ds.Relations.Add(relat);
DataColumn count = new DataColumn("Product(#)", typeof(int), "SUM(Child(CatProds).categoryID)");
ds.Tables["categoriesTB"].Columns.Add(count);
GridView1.DataSource = ds.Tables["CategoriesTB"];
GridView1.DataBind();
}
}
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