Compilation error (line 7, col 23): 'YakıtTipi': member names cannot be the same as their enclosing type
Compilation error (line 3, col 10): The type or namespace name 'Key' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 3, col 10): The type or namespace name 'KeyAttribute' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 6, col 10): The type or namespace name 'Required' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 6, col 10): The type or namespace name 'RequiredAttribute' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 6, col 56): The type or namespace name 'StringLength' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 6, col 56): The type or namespace name 'StringLengthAttribute' could not be found (are you missing a using directive or an assembly reference?)