SqlDataAdapter provides the communication between the Dataset and the Data Source with the help of SqlConnection Object . The SqlConnection Object has no information about the data it retrieves . Similarly a Dataset has no knowledge of the Data Source where the data coming from. So the SqlDataAdapter manage the communication between these two Objects.
The SqlDataAdapter object allows us to populate Data Tables in a DataSet. We can use Fill method of the SqlDataAdapter for populating data in a Dataset. The following source code shows a simple program that uses SqlDataAdapter to retrieve data from Data Source with the help of SqlConnection object and populate the data in a Dataset.
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 adapter As SqlDataAdapter
Dim ds As New DataSet
Dim i As Integer
connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"
connection = New SqlConnection(connetionString)
Try
connection.Open()
adapter = New SqlDataAdapter("Your SQL Statement Here", connection)
adapter.Fill(ds)
connection.Close()
For i = 0 To ds.Tables(0).Rows.Count - 1
MsgBox(ds.Tables(0).Rows(i).Item(1))
Next
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
End Class