在ASP.Net中设置GridView BoundField

我希望将数据源设置为我的绑定字段项，但我没有这样做，我的输出没有达到预期的

输出

边界字段用户名movieComment

预期输出

边界场

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SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
SqlCommand cmdReadComment = new SqlCommand("SELECT  [userName],[movieComment] FROM [movieCommentTable] WHERE [movieTitle]='" + lblHeadTitle.Text + "'", conn);
SqlDataReader dtrReadComment;
conn.Open();
dtrReadComment = cmdReadComment.ExecuteReader();
GridView2.DataSource = dtrReadComment;
GridView2.RowStyle.Height = 200;

BoundField userNameBF = new BoundField();
userNameBF.DataField = "userName";
userNameBF.ItemStyle.Width = 180;
GridView2.Columns.Add(userNameBF);        
GridView2.DataBind();

SELECT  [userName] FROM [movieCommentTable] WHERE...