protected void Button1_Click(object sender, EventArgs e)
        {
            DataTable t1 = new DataTable();
            t1 = GetTable();
            for (int i = 3; i < t1.Rows.Count; i++)
                t1.Rows.RemoveAt(i);

<EmptyDataRowStyle BackColor="Transparent"  HorizontalAlign="Center" />
         <PagerStyle BackColor="Yellow" />
         <PagerSettings Mode="NumericFirstLast" />

protected void GridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            
            DataSet myDataSet

 System.NullReferenceException was unhandled by user code

 
DataSet myDataSet = new DataSet(); 
 try
        {
            myConnection.Open();
            // create the data
            GenerateDataSet(myDataSet, myConnection);
        }
        finally
        {
            myConnection.Close();