sql语句查询怎么判断查询结果为空？

sqldataadapter适合用在查询较多字段时.....

string sou = "select * from art where content like '%" + TextBox1.Text + "%'";SqlDataAdapter da = new SqlDataAdapter(sou, conn);DataSet ds = new DataSet();da.Fill(ds);if (ds.Tables[0].rows.count==0){ Response.Write("没有记录！");} else{ this.sou.DataSource = ds; this.sou.DataBind｝