Get difference between two times

I have a start time and an end time.  I need the difference between the two.

I am new to C# and need the best way to do this.  I am sure this is wrong but this is basically what I need to do.

            DateTime StartTime = DateTime.Now;
            DateTime EndTime = DateTime.Now;

 label1.Text = "Total time to do project: " + DateDiff(StartTime, EndTime);

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Shaun KlineLead Software EngineerCommented:
Consider using the Timespan object ( It provides a lot of functionality:
TimeSpan interval = EndTime - StartTime;
label1.Text = "Total time to do project: " + interval.TotalMinutes;

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huerita37Author Commented:
Thank you
*No Points*

Shaun is correct.  Proof of concept:
using System;

namespace EE_Q28713211
	class Program
		static void Main(string[] args)
			DateTime start = new DateTime(2015, 11, 9, 4, 30, 00);
			DateTime end = new DateTime(2015, 11, 9, 5, 15, 00);
			Console.WriteLine("Difference between {0} and {1} is {2} minutes.", start.ToString("h:mm"), end.ToString("h:mm"), (end - start).TotalMinutes);

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Produces the following output -Capture.JPG-saige-
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