Error: Object reference not set to an instance of an object for data-class if no record in GridView in ASP.Net

Hi umiiiiiii,

You need to handle like below.

if (!IsPostBack)
{
    BindData();
    if (grd_job.Rows.Count > 0)
    {
        //Attribute to show the Plus Minus Button.
        grd_job.HeaderRow.Cells[1].Attributes["data-class"] = "expand";

        //Attribute to hide column in Phone.
        //grd_job.HeaderRow.Cells[0].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[2].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[3].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[4].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[5].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[6].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[7].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[8].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[9].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[10].Attributes["data-hide"] = "phone";
        grd_job.HeaderRow.Cells[11].Attributes["data-hide"] = "phone";
        //Adds THEAD and TBODY to GridView.
        grd_job.HeaderRow.TableSection = TableRowSection.TableHeader;
    }
}

and change EmptyDataRowStyle ForeColor property to Black.

<EmptyDataRowStyle Font-Size="30px" Font-Bold="True" ForeColor="Black" />