protected void yourDefectsGridView_SelectedIndexChanged(object sender, EventArgs e)
{
GridView gv = (GridView)sender;
int defectID = (int)gv.SelectedDataKey.Value;
DefectsDataAccess defectsDataAccess = new DefectsDataAccess();
this.defectDescriptionTextBox.Text = defectsDataAccess.GetDefectDescription(defectID);
}