label1.DataBindings.Add("Text", textBox1, "Text", true,
                            DataSourceUpdateMode.OnPropertyChanged,
    			"<NULL>","{0:H}",new MyFormat());

string test =(string.Format(_superFormat, "{0}", "this is my arg"));

class MyFormat : IFormatProvider, ICustomFormatter
    {
    	string ICustomFormatter.Format(string format, object arg, IFormatProvider formatProvider)
    	{
    		string result = ((string)arg).ToUpper();
    		return result ;
    	}
    	object IFormatProvider.GetFormat(Type formatType)
    	{
    		if (formatType == typeof(ICustomFormatter))
    			return this;
    		else
    			return null;
    	}
    }