GridView/DataList无数据时仍然显示表头
GridView操作：
private void fillgv()
{
string str_sql = "select sp_gl.sp_no,sp_gl.sp_mc,sp_gl.sp_gg,sp_gl.sp_dw,sp_gl.sp_jg1,sp_gl.sp_bzsl,sp_gl.sp_bzsl*sp_gl.sp_jg1 as as_xdj,collect.co_rq from sp_gl,collect where sp_gl.sp_no=collect.sp_no and collect.cu_id=+" + Session["UserId"].ToString();
DataTable dt = con.ExcuteSelect(str_sql);
this.GridView1.DataSource = dt;
this.GridView1.DataBind();

if (dt.Rows.Count == 0)
{
dt.Rows.Add(dt.NewRow());
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 = "无内容";
GridView1.RowStyle.HorizontalAlign = System.Web.UI.WebControls.HorizontalAlign.Center;
}

}DataList操作：
private void fill_dlProducts(string a)
{
string strSel = "select * from sp_gl ";
SqlDataAdapter da = new SqlDataAdapter(strSel, con.con);
dtTable = new DataTable();
da.Fill(dtTable);
this.dlProducts.DataSource = dtTable;
this.dlProducts.DataBind();

if (dtTable.Rows.Count == 0)
{
dtTable.Rows.Add(dtTable.NewRow());
dlProducts.DataSource = dtTable;
dlProducts.DataBind();
Label l = new Label();
l.Text = "对不起,没有您所查询的产品!";
dlProducts.Items[0].Controls.Clear();
dlProducts.Items[0].Controls.Add(l);
}
}