ASP.NET & C#: Modify the character limit of a textbox

Currently, a textbox is set to allow 50 characters. I need to limit it to 40 characters. None of my below attempts seem to be working:

I tried doing this in the ascx.cs file:
txtName1.MaxLength = 40;

I also tried doing this in the .ascx file:
<TD class="ControlLayoutCell"><cc1:i1textbox id="txtName1" tabIndex="2" runat="server" Text="" Width="100%" MaxLength="40"><LabelStyle CssClass="TextBoxEditDisabled"></LabelStyle>
													<TextBoxStyle CssClass="TextBoxGeneric"></TextBoxStyle>
												</cc1:i1textbox></TD>

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pzozulkaAsked:
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draekCommented:
You are using a custom textBox class or something? I'm asking this because the default component will act as you like, so if you're doing textBox1.MaxLength will do the job.
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Robberbaron (robr)Commented:
yes, you need to provide more details about the custom control
i1Textbox
as i cant find any references to it elsewhere.
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