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By Reference Sample (Pass a Type by Reference) 

Visual Studio 2005

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This sample demonstrates passing a reference type, a value type, or a primitive type by reference to a method.

The sample declares a point type as a value type, and then instantiates the value type. Methods are called on the value type, and it is passed by reference to a method.

You can also pass primitive types as parameters by reference, as the swap method demonstrates.

Security noteSecurity Note

This sample code is provided to illustrate a concept and should not be used in applications or Web sites, as it may not illustrate the safest coding practices. Microsoft assumes no liability for incidental or consequential damages should the sample code be used for purposes other than as intended.

Building and Running the Sample

To open the sample file in Solution Explorer

  1. Click Download Sample.

    The File Download message box appears.

  2. Click Open, and on the left column of the zip folder window, click Extract all files.

    The Extraction Wizard opens.

  3. Click Next. You can change the directory that the files will be extracted to, and then click Next again.

    Make sure that the Show extracted files check box is selected, and click Finish.

  4. Double-click the sample's .sln file.

    The sample solution is displayed in Solution Explorer. You might get a security warning that says the solution location is not trusted. Click OK to continue.

To build and run this sample

  1. On the Build menu, click Build Solution.


    From the command line, type BUILD.bat.


    For more information, see Building from the Command Line (Visual J#).

  2. From the command line, type app.

  3. Examine the output. Expected output:

    Does p1 equal p2: true
    Does p1 equal p2: false
    Swapping two values
    Before swap: i = 1 j = 101
    After swap: i = 101 j = 1

See Also