为什么我删除不了。。DataGrid里面的CheckBox选中删除问题

                Dim   i   As   Integer
                Dim   ChBox   As   CheckBox
                For   i   =   0   To   DataGrid1.Items.Count   -   1
                        ChBox   =   CType(DataGrid1.Items(i).Cells(0).FindControl( "CheckBox1 "),   CheckBox)
                        If   ChBox.Checked   =   True   Then
                                Dim   conn   As   New   SqlConnection
                                conn.ConnectionString   =   "server=127.0.0.1;uid=sa;pwd=;database=netexam "
                                conn.Open()
                                Dim   sql   As   String
                                sql   =   "delete   from   question   where   id=ChBox "
                                Dim   cmd   As   New   SqlCommand(sql,   conn)
                                cmd.ExecuteNonQuery()
                                bind()
                        End   If
                Next

------解决方案--------------------
因为你没有在循环结束就调用了Bind()方法， 如果你选择的不是第一行， 下面的CheckBox的选择全都没有效了， 你只需把Bind()的调用放在For循环后就OK了， 如下。
Dim i As Integer
Dim ChBox As CheckBox
Dim label1 As Label

For i = 0 To DataGrid1.Items.Count - 1
ChBox = CType(DataGrid1.Items(i).Cells(0).FindControl( "CheckBox1 "), CheckBox)

label1 = CType(DataGrid1.Items(1).FindControl( "label1 "), Label)
If ChBox.Checked = True Then
Dim conn As New SqlConnection
conn.ConnectionString = "server=127.0.0.1;uid=sa;pwd=;database=netexam "
conn.Open()
Dim sql As String
sql = "delete from question where id= ' " + label1.Text + " ' "
Dim cmd As New SqlCommand(sql, conn)
cmd.ExecuteNonQuery()
End If
Next
bind()