Alert while clicking the button with matching the gridview l

I am trying to bring alert while i click the button if condition of "Gridview" label value is above zero. but its not working need your views.

 

my current code is 

 

protected void Button1_Click(object sender, EventArgs e)     {         var countForZero = from GridViewRow gr in gvEmployeeDetails.Rows                            where (gr.FindControl("Literal4") as Label).Text.Equals("0")                            select gr;                       if (countForZero.ToList().Count < 0)                           {                 Messagebox("Messagebox Pop up Alert!!!");           }              BindGrid();     }     private void Messagebox(string Message)     {         Label lblMessageBox = new Label();         lblMessageBox.Text =             "";         Page.Controls.Add(lblMessageBox);     }