[Solved] Request.Params('__EVENTTARGET') returns null in ASP.Net

Hi Sumeet,

Just add UseSubmitBehavior="false" to your button.

HTML

<asp:Button ID="BTNLOGIN" Text="Login" runat="server" OnClick="BTNLOGIN_Click" UseSubmitBehavior="false" />

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (Request.Params["__EVENTTARGET"] != null)
    {
        if (Request.Params["__EVENTTARGET"].ToString().ToUpper().Contains("BTNLOGIN"))
        {
            if (Request.RequestType.ToString().ToUpper() != "POST")
            {
                Response.Redirect("ErrorPage.html", true);
                return;
            }
        }


        if (Request.UrlReferrer == null/* TODO Change to default(_) if this is not a reference type */ )
        {
            Response.Redirect("index.aspx", true);
        }
    }
    if (!Page.IsPostBack)
    {
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Request.Params("__EVENTTARGET") IsNot Nothing Then
        If Request.Params("__EVENTTARGET").ToString().ToUpper().Contains("BTNLOGIN") Then
            If Request.RequestType.ToString().ToUpper() <> "POST" Then
                Response.Redirect("ErrorPage.html", True)
                Return
            End If
        End If
        If Request.UrlReferrer Is Nothing Then
            Response.Redirect("index.aspx", True)
        End If
    End If

    If Not Page.IsPostBack Then
    End If
End Sub