Open popup window and redirect to another page in ASP.Net using C# and VB.Net

Hi cgisriram,

Refer below code.

Code

C#

protected void OnVerify(object sender, EventArgs e)
{
    string landingPage = "Default.aspx";
    // verify whether user is assigned with a popup window or not.
    bool isAssigned = true;
    if (isAssigned)
    {
        string url = "https://www.aspsnippets.com/";
        string script = "window.open('" + url + "', 'popup_window', 'width=450,height=500,left=450,top=50,resizable=no');window.location='" + landingPage + "'";
        ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", script, true);
    }
    else
    {
        Response.Redirect(landingPage);
    }
}

VB.Net

Protected Sub OnVerify(ByVal sender As Object, ByVal e As EventArgs)
    Dim landingPage As String = "Default.aspx"
    ' verify whether user is assigned with a popup window or not.
    Dim isAssigned As Boolean = True
    If isAssigned Then
        Dim url As String = "https://www.aspsnippets.com/"
        Dim script As String = "window.open('" & url & "', 'popup_window', 'width=450,height=500,left=450,top=50,resizable=no');window.location='" & landingPage & "'"
        ScriptManager.RegisterStartupScript(Me, Me.GetType(), "popup", script, True)
    Else
        Response.Redirect(landingPage)
    End If
End Sub