Erro以数据形式出现

问题描述

下面是我的代码

Below is my code

 <toolkit:DataField FontWeight="SemiBold"  HorizontalAlignment="Left"      VerticalContentAlignment="Top">
        <toolkit:DataField.Label>
                <StackPanel Orientation="Horizontal" x:Name="stkpnl_labelStar">
                       <TextBlock x:Name="txtblk_labelstar" Text="*"  Foreground="Red"/>
                      <TextBlock x:Name="txtblk_label" Text="Label Name :" />
                </StackPanel>
        </toolkit:DataField.Label>
       <TextBox Text="{Binding label_name, Mode=TwoWay, NotifyOnValidationError=True,
                ValidatesOnExceptions=True, UpdateSourceTrigger=Explicit}"  

                x:Name="txt_label_name" Width="200" HorizontalAlignment="Left" FontWeight="Normal"/>
</toolkit:DataField>

当我将以上代码用于Dataform Datafield时，我想在编辑"模式下打开我的数据表单，然后出现以下错误:
值不在预期范围内."
任何人都可以帮助我.

when i use above code for Dataform Datafield,and i want to open my dataform in Edit mode then i Got below Error:
"Value doesnot fall within expected range."
can any one help me.

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