Dataset represents a collection of data retrieved from the Data Source. The Dataset can work with the data it contains, without knowing the source of the data coming from. The SqlDataAdapter object allows us to populate DataTable in a DataSet. We can use Fill method in the SqlDataAdapter for populating data in a Dataset. The Dataset can contains more than one Table at a time. The data inside Table is in the form of Rows and Columns .
In some situations we have to find the column headers in a DataTable. There is a ColumnsCollection object in the Datatable hold the column Definitions.
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 adapter As New SqlDataAdapter
Dim ds As New DataSet
Dim dt As DataTable
Dim column As DataColumn
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)
adapter.SelectCommand = command
adapter.Fill(ds, "SQL Temp Table")
adapter.Dispose()
command.Dispose()
connection.Close()
dt = ds.Tables(0)
For Each column In dt.Columns
MsgBox(column.ColumnName)
Next
Catch ex As Exception
MsgBox("Can not open connection ! ")
End Try
End Sub
End Class