get the value of selected row in datagridview

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ASP.NET

Hi all,

I have a datagridview with hyperlink column. i want to open a modal pop up when uer clicks of the hyperlink. I also want to load the controls in the modal pop up with values in the grid row .

here is teh current code:

<script type="text/javascript">
    function Edit() {
       document.getElementById('<%=btnEdit.ClientID%>').click();
       }
</script>

<asp:HyperLink ID = "hpUserAlias" Width="100%" runat="server" Text='<%# Bind("UserAlias") %>' Font-Underline = "true" ForeColor = "Blue" onclick = "Edit();" >

protected void btnEdit_Click(object sender, EventArgs e)
       {GridViewRow row;
            row = grdUsers.SelectedRow;
}

I am getting a null value in the SelectedRow property.

Can anyone help please?

Thanks.
Ann.