学c#高级编程的疑惑-设定datagrid的样式DataGridTableStyle 结果看不到一个字段(在线等待)

[JCC0128]

代码如下所示，结果是，datagrid中含有数据，但是看不到一个字段，每一行只有左边的一个指示栏,indicator,检查n遍了，救命呀
实在没分，请包含

数据库对应表名 aClass
两个字段,ClassID VARCHAR(20) ,ClassName varchar(20)

private void button1_Click(object sender, System.EventArgs e)
{
ds = new DataSet() ;

SqlDataAdapter da = new SqlDataAdapter("select * from aClass",sqlConnection1) ;
da.Fill(ds,"aClass") ;

DataGridTableStyle style = new DataGridTableStyle() ;
style.MappingName = "aClass" ;
//style.AlternatingBackColor = System.Drawing.Color.Bisque ;

DataGridTextBoxColumn ClassID = new DataGridTextBoxColumn() ;
ClassID.HeaderText = "班级标识" ;
ClassID.MappingName = "ClassID " ;
ClassID.Width = 100 ;

DataGridTextBoxColumn ClassName = new DataGridTextBoxColumn() ;
ClassID.HeaderText = "班级名称" ;
ClassID.MappingName = "ClassName " ;
ClassID.Width = 100 ;

style.GridColumnStyles.AddRange( new DataGridColumnStyle[] {ClassID, ClassName} ) ;
dataGrid1.TableStyles.Add(style ) ;

dataGrid1.SetDataBinding(ds,"aClass") ;

}

[JCC0128]

up

[greenhill1]

dataGrid1.DataSource = thisDataSet.Tables["aClass"];

DataGridTableStyle dgts = new DataGridTableStyle();

dgts.MappingName = "aClass";
DataGridTextBoxColumn TextCol = new DataGridTextBoxColumn();
TextCol.MappingName = "ClassID";
TextCol.HeaderText = "序号";
TextCol.Width = 60;
dgts.GridColumnStyles.Add(TextCol);

TextCol = new DataGridTextBoxColumn();
TextCol.MappingName = "ClassName";
TextCol.HeaderText = "科目";
TextCol.Width = 60;
dgts.GridColumnStyles.Add(TextCol);
dataGrid1.TableStyles.Add(dgts);