function magicmatrix
    key = 'MagicMatrix';
    m = getmcruserdata(key);
    disp(m);
    m = m + 1;
    setmcruserdata(key, m);

mcc -Ngv -W dotnet:MagicMatrixComponent,MagicMatrix -T link:lib \
         magicmatrix.m setmcruserdata.m getmcruserdata.m

// Create the key and the data
string key = "MagicMatrix";
double[,] magicData = { {8, 1, 6},
                        {3, 5, 7},
                        {4, 9, 2} };
// Create an instance of the component created by the builder 
MagicMatrix m = new MagicMatrix();

// Store a magic matrix under the key "MagicMatrix"
m.setmcruserdata(key, (MWNumericArray)magicData);

// Create the key, declare a variable to receive the value
String key = "MagicMatrix";
Object[] result = null;

// Create the component class (and the associated MCR instance)
m = new magicmatrix();

// Retrieve the value stored under the key in the map owned by the MCR 
// associated with the component m.
result = m.getmcruserdata(1, key);

function magicmatrix
    key = 'MagicMatrix';
    m = getmcruserdata(key);
    disp(m);
    m = m + 1;
    setmcruserdata(key, m);

This command assumes the existence of a component named MagicMatrixComponent and a user-written main program in udata.cs.

C:\WINNT\Microsoft.NET\Framework\v2.0.50727\csc.exe \
        /reference:magicmatrixComponent.dll \
        /reference:%MWE_INSTALL%\toolbox\dotnetbuilder\bin\win32\v2.0\MWArray.dll udata.cs

C:\> udata.exe

// udata.cs
// Demonstrate the MCR User Data interface API in the builder.
using System;

using MathWorks.MATLAB.NET.Utility;
using MathWorks.MATLAB.NET.Arrays;

using MagicMatrixComponent;

namespace MathWorks.Demo.UserData
{
class MagicMatrixTest
{
    [STAThread]
    static void Main(string[] args)
    {
        string key = "MagicMatrix";
        MWArray result = null;

        try
        {
            double[,] magicData = { {8, 1, 6},
                                    {3, 5, 7},
                                    {4, 9, 2} };

            // Create an instance of the component 
            // created by the builder 
            MagicMatrix m = new MagicMatrix();

            // Call the functions exported by the component, using 
            // per-MCR instance state to communicate between 
            // the C# wrapper code and the executing M-functions. 
            //
            // First, store a magic matrix under the key "MagicMatrix"
            m.setmcruserdata(key, (MWNumericArray)magicData);

            // Add 1 to the magic matrix, display it, and save 
            // the new value in the per-MCR instance data.
            m.magicmatrix();

            // Retrieve the new value stored under "MagicMatrix."
            result = m.getmcruserdata(key);

            // Print the result matrix
            Console.WriteLine(result);
        }
        catch(Exception exception)
        {
            Console.WriteLine("Error: {0}", exception);
        }
    }
}
}