ValueChanged事件

If e.Sender.Value IsNot Nothing Then
    Dim dt As DataTable
    cmd1.CommandText = "Sｅlect [_Identify],姓名 ,性别 ,年龄 From {病人信息} Where 住院号 = \'" & e.Sender.Value & "\'"
    dt = cmd1.ExecuteReader()
    If dt.DataRows.Count > 0 Then
        e.Form.Controls("TextBox2").Value = dt.DataRows(0)("姓名")
        e.Form.Controls("TextBox3").Value = dt.DataRows(0)("性别")
        e.Form.Controls("TextBox4").Value = dt.DataRows(0)("年龄")
    End If
End If

Enter事件

If Tables.Contains(e.form.TableName) Then
    If Tables(e.form.TableName).Current IsNot Nothing
        Dim dr As DataRow = Tables(e.form.TableName).Current.DataRow
        If dr.RowState <> DataRowState.Added Then \'如果不是新增行
            e.Sender.ReadOnly = BooleanEnum.True
        End If
    End If
End If