C# Signature:

[DllImport("coredll.dll", SetLastError=true)]
static extern uint EnableMenuItem(IntPtr hMenu, uint itemId, uint uEnable);

User-Defined Types:

[uEnable]

    uint MF_BYCOMMAND = 0x00000000;
    uint MF_BYPOSITION = 0x00000400;
    uint MF_ENABLED = 0x00000000;
    uint MF_GRAYED = 0x00000001;
    uint MF_STRING = 0x00000000;

Alternative Managed API:

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Notes:

None.

Tips & Tricks:

Use MF_BYCOMMAND to specify the item ID on [itemId] parameter or use MF_BYPOSITION to specify the zero-based index of the item, if neither MF_BYCOMMAND nor MF_BYPOSITION is specified the item ID is used.

Sample Code:

    IntPtr hMenu = CreatePopupMenu();
    AppendMenu(hMenu, MF_STRING, 1001, "Enabled Item");
    AppendMenu(hMenu, MF_STRING, 1002, "Disabled Item");
    EnableMenuItem(hMenu, 0, MF_BYPOSITION | MF_ENABLED);
    EnableMenuItem(hMenu, 1002, MF_BYCOMMAND | MF_GRAYED);