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Compiler Error CS0200

Property or indexer 'property' cannot be assigned to — it is read only

An attempt was made to assign a value to a property, but the property does not have a set accessor. Resolve the error by adding a set accessor. For more information, see How to: Declare and Use Read/Write Properties (C# Programming Guide).

Example

The following sample generates CS0200:

// CS0200.cs
public class MainClass
{
    // private int _mi;
    int I
    {
        get
        {
            return 1;
        }

        // uncomment the set accessor and declaration for _mi
        /*
        set
        {
            _mi = value;
        }
        */
    }

    public static void Main ()
    {
        MainClass II = new MainClass();
        II.I = 9;   // CS0200
    }
}