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ADO.NET SQL Server Connection

VB.Net SQL Server Connection

You can connect your VB.Net application to data in a SQL Server database using the Microsoft .NET Framework Data Provider for SQL Server. The first step in a VB.Net application is to create an instance of the Server object and to establish its connection to an instance of SQL Server.

ADO.NET SQL Server Connection

The SqlConnection Object is Handling the part of physical communication between the application and the SQL Server Database. An instance of the SqlConnection class in .NET Framework is supported the Data Provider for SQL Server Database. The SqlConnection instance takes Connection String as argument and pass the value to the Constructor statement. When the connection is established , SQL Commands may be executed, with the help of the Connection Object, to retrieve or manipulate data in the database. Once the Database activities over , Connection should be closed and release the database resources .

Sql Server connection string

connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName; User ID=UserName;Password=Password"

If you have a named instance of SQL Server, you'll need to add that as well.

"Server=localhost\sqlexpress"

The Close() method in SqlConnection class is used to close the Database Connection. The Close method rolls back any pending transactions and releases the Connection from the SQL Server Database.

A Sample VB.Net Program that connect SQL Server using connection string.

Imports System.Data.SqlClient Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim connetionString As String Dim cnn As SqlConnection connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password" cnn = New SqlConnection(connetionString) Try cnn.Open() MsgBox("Connection Open ! ") cnn.Close() Catch ex As Exception MsgBox("Can not open connection ! ") End Try End Sub End Class

Connecting to SQL Server using windows authentication

"Server= localhost; Database= employeedetails; Integrated Security=SSPI;"

Trusted Connection from a CE device

connetionString="Data Source=ServerName; Initial Catalog=DatabaseName;Integrated Security=SSPI; User ID=myDomain\UserName;Password=Password;

This will only work on a CE device

Connect via an IP address

connetionString="Data Source=IP_ADDRESS,PORT; Network Library=DBMSSOCN; Initial Catalog=DatabaseName; User ID=UserName;Password=Password"

1433 is the default port for SQL Server.

A sample VB.Net program that demonstrate how to execute sql statement and read data from SQL server.

Imports System.Data.SqlClient Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim connetionString As String Dim connection As SqlConnection Dim command As SqlCommand Dim sql As String connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password" sql = "Your SQL Statement Here , like Select * from product" connection = New SqlConnection(connetionString) Try connection.Open() command = New SqlCommand(sql, connection) Dim sqlReader As SqlDataReader = command.ExecuteReader() While sqlReader.Read() MsgBox(sqlReader.Item(0) & " - " & sqlReader.Item(1) & " - " & sqlReader.Item(2)) End While sqlReader.Close() command.Dispose() connection.Close() Catch ex As Exception MsgBox("Can not open connection ! ") End Try End Sub End Class

A sample VB.Net program that perform Data Manipulation tasks like Insert , Update , Delete etc. also perform by the ExecuteNonQuery() of SqlCommand Object.




Imports System.Data.SqlClient
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim connetionString As String
        Dim connection As SqlConnection
        Dim command As SqlCommand
        Dim sql As String

        connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"
        sql = "Your SQL Statement Here"

        connection = New SqlConnection(connetionString)
        Try
            connection.Open()
            command = New SqlCommand(Sql, connection)
            command.ExecuteNonQuery()
            command.Dispose()
            connection.Close()
            MsgBox(" ExecuteNonQuery in SqlCommand executed !!")
        Catch ex As Exception
            MsgBox("Can not open connection ! ")
        End Try
    End Sub
End Class




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