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Passing null value to a DateTime? parameter get the parameter populated with random values

C# Visual Studio 2015 Ultimate, Asp.net MVC 3 project

I'm passing null to a method expecting a DateTime? parameter In debugging mode the parameter is populated with a random different value every time

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You can do a check with the variable like

 if(fecha.HasValue)
    {
    //do required
    }
    else
    {
//set a default date time    
fecha=DateTime.MinValue
    }

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