String Format not working

I am trying to displa开发者_如何转开发y a number, stored in a dataset as a string, as a phone number. I have a label that Binds to a value but doesn't display the format that I passed as an arg:

<asp:Label ID="lbl005108002" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "phone number", "{0:(###) ###-####}") %>'></asp:Label>

As a test I tried to pass the formated string into the dataitem but that didn't work either. Is there something else I need to do in order to use this function?

m_Row("phone number") = String.Format("{0:(###) ###-####}", value)

The value displays in both cases as: 04152543926

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I prefer to do the databinding in my codebehind:

<asp:Label ID="lbl005108002" runat="server" Text="" OnDataBinding="lbl005108002_DataBinding"></asp:Label> 

In codebehind:

protected void lbl005108002_DataBinding(object sender, System.EventArgs e)
{
    Label lbl = (Label)(sender);
    lbl.Text = String.Format("{0:(###) ###-####}", (int)(Eval("phone number")));
}

I think the key is that cast to int so that the formatter knows how to deal with the value you are sending it. I prefer doing this in codebehind because sometimes trying to cram everything inline makes things less explicit.

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What type is value? This seems to format ok for me:

     int phone_num = 1231231234;
     string f = String.Format("{0:(###) ###-####}", phone_num);

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An alternative way is:

Dim i as Integer = 5551234567 Dim s As String = i.ToString("(###) ###-####")

The ToString is the fast way I use. What I did is in th eCommand window I did this:

? 5551234567.ToString("(###) ###-####")

The result was:

"(555) 123-4567"

So I am sure it works. Good luck!