Asp.Net - Drop down list filtration on gridview

Example :

Assume that you have two dropdownlist inside gridview , One is Department another one is Employee based on Department selection which you want to load Employees.

Sample :

protected void ddlDepartment_SelectedIndexChanged(object sender, EventArgs e)

    {

        try

        {

            DropDownList ddlDepartment = (DropDownList)sender;

            GridViewRow gvr = (GridViewRow)ddl.NamingContainer;

            DropDownList ddlEmployee = gvr.FindControl("ddlEmployee ") as DropDownList;

            if (ddlDepartment.SelectedIndex > 0)

            {

                // Load employee details based on department.

            }

        }

        catch (Exception ex)

        {

        }

    }