GridView无数据显示表头

void BindGridView()
{
DataTable dt = GetTable();
if (GetTable().Rows.Count == 0)
{

dt.Rows.Add(dt.NewRow());
this.GridView1.DataSource = dt;
GridView1.DataBind();
int columnCount = GridView1.Rows[0].Cells.Count;
GridView1.Rows[0].Cells.Clear();
GridView1.Rows[0].Cells.Add(new TableCell());
GridView1.Rows[0].Cells[0].ColumnSpan = columnCount;
GridView1.Rows[0].Cells[0].Text = "无符合数据,请重新设定搜索条件.";
GridView1.Rows[0].Cells[0].ForeColor = System.Drawing.Color.Red;
}
//this.GridView1.DataSource = GetTable();
//this.GridView1.DataBind();
}