C# : Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion

C# : Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion exists
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C# : Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion exists
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convert type exists Cannot 'System.DateTime?' to implicitly : An 'System.DateTime'. C# conversion explicit