try

{

    IEdmVault7 vault2 = null;

    if (vault1 == null)

    {

      vault1 = new EdmVault5();

    }

     vault2 = (IEdmVault7)vault1;

    if (!vault1.IsLoggedIn)

    {

       vault1.LoginAuto(VaultsComboBox.Text, this.Handle.ToInt32());

    }

    IEdmFile5 aFile = default(IEdmFile5);

    IEdmFolder5 ppoRetParentFolder = null;

    aFile = vault2.GetFileFromPath(ListBox.Items[0].ToString(), out ppoRetParentFolder);

    if (!aFile.IsLocked)

    {

        aFile.LockFile(ppoRetParentFolder.ID, this.Handle.ToInt32());

            IEdmEnumeratorVariable5 varEnum = default(IEdmEnumeratorVariable5);

        string aFileName=null;

        varEnum = aFile.GetEnumeratorVariable(aFileName);

        varEnum.SetVar("Vendor", "@", "John");

        IEdmEnumeratorVariable8 enumVariable8 = (IEdmEnumeratorVariable8)varEnum;

        enumVariable8.CloseFile(true);

        aFile.UndoLockFile(this.Handle.ToInt32());

        MessageBox.Show("SetVar Success");

        }

}

EPDM Version 2014,  Variable Name -->Vendor , I want to change card value -->John,

but new data don't update to card variable, Please Help. thank you.