C#查询数据显示列名无效

private void button4_Click(object sender, EventArgs e)
{
conn.ConnectionString = s;
string sql = "select * from personinfo where " + JobName.SelectedItem.ToString() + " like '" + textBox1.Text.Trim() + "'";
ada = new SqlDataAdapter(sql,conn);
ds = new DataSet();
ada.Fill(ds);
dataGridView1.DataSource = ds;
dataGridView1.DataMember = ds.Tables[0].ToString();显示的错误是：列名 '会计师' 无效。

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