ASP.NET

if (!Page.IsPostBack)
{ 
Response.Buffer = true;
Response.ExpiresAbsolute=DateTime.Now.AddDays(-1d);
Response.Expires =-1500;
Response.CacheControl = "no-cache";

if (Session["UserName"] != null)
{
try
{
lblMsg.Text = Session["Type"].ToString()+" ("+ Session["UserName"].ToString()+")";
}
catch
{ 
Server.Transfer("../Admin/Default.aspx");
}
}
else
{
Server.Transfer("../Admin/Default.aspx");
}
}

Response.Buffer = true;
Response.ExpiresAbsolute=DateTime.Now.AddDays(-1d);
Response.Expires =-1500;
Response.CacheControl = "no-cache";

if (Session["UserName"] != null && Session["Type"] != null)
{
lblMsg.Text = Session["Type"].ToString()+" ("+ Session["UserName"].ToString()+")";
}
else
{
Response.Redirect("../Admin/Default.aspx");
}

<meta http-equiv="pragma" content="nocache" />

Private Sub GridView1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.PreRender
        Dim GV As GridView = CType(sender, GridView)
        Dim Tbl As Table = CType(GV.Controls(0), Table)
        Tbl.Controls.AddAt(index, AddEmptyRow)
End Sub

Function AddEmptyRow() As GridViewRow
        Dim GVR As GridViewRow = New GridViewRow(0, 0, DataControlRowType.EmptyDataRow, DataControlRowState.Normal)
        Dim cell As TableCell = New TableCell
        cell.ColumnSpan = ColumnCount
        cell.Text = " "
        GVR.Cells.Add(cell)
        Return GVR
End Function