Здравейте! Някой може ли да ме светне къде бъркам: Условието на задачата е: Какъвто и код да компилирам в този проект, все дава грешка..на какво се дължи?

A marketing company wants to keep record of its employees. Each record would have the following characteristics:

• First name
• Last name
• Age (0...100)
• Gender (m or f)
• Personal ID number (e.g. 8306112507)
• Unique employee number (27560000…27569999)

Declare the variables needed to keep the information for a single employee using appropriate primitive data types. Use descriptive names. Print the data at the console.

            string FirstName = "Tupac";
            string LastName = "Shakur";
            int age = 25;
            string gender = "m";
            long PersonalID = 8306112507;
            int EmployeeNumber = 27534591;
            Console.WriteLine("First name: {0}", FirstName);
            Console.WriteLine("Last name: {1}", LastName);
            Console.WriteLine("Age: {2}", age);
            Console.WriteLine("Gender: {3}", gender);
            Console.WriteLine("Personal ID: {4}", PersonalID);
            Console.WriteLine("Unique Employee number: {5}", EmployeeNumber);

и защо ми дава тези събщения:
Severity    Code    Description    Project    File    Line
Error        Could not copy "obj\Debug\10.EmployeeData.exe" to "bin\Debug\10.EmployeeData.exe". Exceeded retry count of 10. Failed.    10.EmployeeData        

Severity    Code    Description    Project    File    Line
Error        Unable to copy file "obj\Debug\10.EmployeeData.exe" to "bin\Debug\10.EmployeeData.exe". The process cannot access the file 'bin\Debug\10.EmployeeData.exe' because it is being used by another process.    10.EmployeeData