databinder.eval question

I need to evaluate a field then send that data to a function to evaluate once more so I can display a name.  Here is what happens, I run a databinder.eval(Container.Dataitem, "BrnId") to get the branch ( it should yield 001, 002 005, etc).  Then I want to call my function GetBranch which uses a switch statement to give me the branch name.  However, I don't know how to position my inline ASP.Net tags so that it evaluates first, then calls my function second.  attached is my code.

<Script Runat="Server" type="text/C#">
	public string GetBranch(string BranchId)
	{
		string Branch = "";
		switch(BranchId)
		{
			case "001":
				Branch = "Columbus";
			break;
			case "002":
				Branch = "Youngstown";
			break;
			case "005":
				Branch = "Pittsburgh";
			break;
			case "006":
				Branch = "Barkeyville";
			break;
			case "007":
				Branch = "Cincinnati";
			break;
			Default:	
				Branch = "Columbus";
			break;
		}
		return Branch;
	}
</Script>
  				
...........

		<ItemTemplate>
		        <table width="946" border="0" cellspacing="0" cellpadding="0" bgcolor="FFFFFF"> 
		        <tr> 
			        <td width="160" height="40" align="left" valign="top" class="resultsbold">Unit: <%# DataBinder.Eval(Container.DataItem, "UntId") %></td> 
				<td width="786" height="40" align="left" valign="top" class="resultsbold">Location:  <%# DataBinder.Eval(Container.DataItem, "BrnId") %> </td>
		        </tr> 

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