How to ADO.NET SqlDataReader

SqlDataReader Object provides a connection oriented data access to the SQL Server data Sources. ExecuteReader() in the SqlCommand Object send the SQL statements to SqlConnection Object and populate a SqlDataReader Object based on the SQL statement.

Dim sqlReader As SqlDataReader = sqlCmd.ExecuteReader()

When the ExecuteReader method in SqlCommand Object execute , it instantiate a SqlClient.SqlDataReader Object. When started to read from a DataReader it should always be open and positioned prior to the first record. The Read() method in the DataReader is used to read the rows from DataReader and it always moves forward to a new valid row, if any row exist .

SqlDataReader.Read()




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 sqlCnn As SqlConnection
        Dim sqlCmd 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"

        sqlCnn = New SqlConnection(connetionString)
        Try
            sqlCnn.Open()
            sqlCmd = New SqlCommand(sql, sqlCnn)
            Dim sqlReader As SqlDataReader = sqlCmd.ExecuteReader()
            While sqlReader.Read()
                MsgBox(sqlReader.Item(0) & "  -  " & sqlReader.Item(1) & "  -  " & sqlReader.Item(2))
            End While
            sqlReader.Close()
            sqlCmd.Dispose()
            sqlCnn.Close()
        Catch ex As Exception
            MsgBox("Can not open connection ! ")
        End Try
    End Sub
End Class

connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"
sql = "Your SQL Statement Here , like Select * from product"

You have to replace the string with your realtime variables.


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