Comments by forme (Top 4 by date)

I am doing something wrong but i am not getting what is the mistake i am doing.Kindly put some code.
Here is the complete code that i am using
protected void gvSuppDelete_SelectedIndexChanged(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(UpdatePanel1, UpdatePanel1.GetType(), "script", "javascript:if(confirm('Are you sure you want to delete?') == false) return false;", true);
SupplierItem si = new SupplierItem();
si.Id = Convert.ToInt32(gvSuppDelete.SelectedValue);
si.SupplierName = gvSuppDelete.SelectedRow.Cells[1].Text;
si.SupplierAddress = gvSuppDelete.SelectedRow.Cells[2].Text;
si.LastUpdatedBy = Session["UserName"].ToString();
si.Status = false;
try
{
BALSupplier sup = new BALSupplier();
int res = sup.UpdateSupplier(si);

if (res > 0)
{
CloseWindow = "alert('Deleted successfully')";
ScriptManager.RegisterStartupScript(UpdatePanel1, UpdatePanel1.GetType(), "CloseWindow", CloseWindow, true);
//lblMsg.Text = "Deleted successfully";
Clear();
gvSuppDelete.DataBind();
}
else
{
if (res == -1)
{
CloseWindow = "alert('Supplier could not be deleted')";
ScriptManager.RegisterStartupScript(UpdatePanel1, UpdatePanel1.GetType(), "CloseWindow", CloseWindow, true);
}
}
}
catch (Exception ex)
{
CloseWindow = "alert('" + ex.Message + "')";
ScriptManager.RegisterStartupScript(UpdatePanel1, UpdatePanel1.GetType(), "CloseWindow", CloseWindow, true);
}
}
please tell me where i am going wrong.

Thank you
This is my code
if (ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "javascript:if(confirm('Are you sure you want to delete?') == false) return false;", true)==true)
{
some code.....
}

and it gives me an error "operator == cannot be applied to operands of type void

Thanks but it does not work.. :(