A function to convert null to string

by 
static string NullToString( object Value )
{

    // Value.ToString() allows for Value being DBNull, but will also convert int, double, etc.
    return Value == null ? "" : Value.ToString();

    // If this is not what you want then this form may suit you better, handles 'Null' and DBNull otherwise tries a straight cast
    // which will throw if Value isn't actually a string object.
    //return Value == null || Value == DBNull.Value ? "" : (string)Value;


}

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