Question : C# DateTime Error

Experts
Please see the code attached and also the image below and please suggest me where is the mistake..
Please suggest me how to debug?
Thanking you,
Anindya 
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DateTime startTime = Convert.ToDateTime(label3.Text);

        DateTime endTime = DateTime.Now;

        TimeSpan span = endTime.Subtract(startTime);
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error.JPG (135 KB) (File Type Details) 
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Answer : C# DateTime Error

Can you list the full class?
Otherwise, try this.

You need to declare them as members without initializing the value.
In the class constructor, do the initialization.
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