Run Excel macro from .net application

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.NET2.0

.NET

macros

exceptions

Hi....

I wanna run a predefined excel macro from my .net application.
I am using the following code for doing this and it is throwing an TargetInvocationException-

Thread t = new Thread(delegate()
{

Excel.Application _excelApp = new Microsoft.Office.Interop.Excel.Application();  

Marshal.GetActiveObject("Excel.Application"); 
_excelApp.GetType().InvokeMember("Run", System.Reflection.BindingFlags.Default 
|
System.Reflection.BindingFlags.InvokeMethod, null, _excelApp, new 
object[] { "SetFont" }); 

});

t.IsBackground = true; 
t.Start();

Please tell me that why it is throwing an exception while this code is running perfectly for Word Application.

Thanks in advance for any help.

Naina.