usercontrol findcontrol from masterpage get a nullreferenceexception

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yumin 51 posts 243 karma points

May 08, 2013 @ 11:34
0

UserControl FindControl from masterpage get a NullReferenceException
my masterpage have some server control like this:
```
<form id="form1" runat="server">
 <umbraco:Macro Alias="aaa" runat="server"></umbraco:Macro>
        
<asp:HiddenField runat="server" ID="hidtest" Value="why i can not findcontrol" />
    
</form>
```
Macro aaa call .NET User Control,in usercontrol the code like this:
```
 string val= ((HiddenField)this.Page.Master.FindControl("hidtest")).Value;
```
but run will get a NullReferenceException,why i can not get a value from masterpage?

thanks in advance
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