Create an expired date alert on a Gridview in ASP.NET in C#

Question

I am doing a final project, where a record of task, description and date is made. But I am unable to put a warning/alert/message on the screen to warn the user that a task is expiring. I am programming for web in ASP.NET, C# and the Database is SQL Server Express. I tried with this code, but nothing happens.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {           
                if (e.Row.RowType == DataControlRowType.DataRow)
                {
                    DateTime dt = DateTime.ParseExact(e.Row.Cells[3].Text, "0:dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture);
                    if (dt < DateTime.Now)
                        e.Row.Style.Add("background-color", "red");
                }               
        }

I would like to leave it that way when a system date coincides with the same computer, not necessarily identical but with some outline, or a background color in the line of the Gridviewer for highlight.

Answer 1

The comparison of dates is never performed because of Response.Redirect.

You can remove the redirect code and replace the IF of the dates by the code below to check the comparison of the dates.

if(dt1.Date > dt2.Date)
{
  Response.Write("Tarefa expirando.");
}
else
{
  Response.Write("TESTE");
}