/// <summary>
/// On fail handler executed in all-catch block of clientContext.Execute() command
/// </summary>
/// <param name="operation">This operation</param>
/// <param name="handler">Handler that is assigned to CSOMOperation.OnFail property</param>
/// <returns>This operation</returns>
public static CSOMOperation Fail(this CSOMOperation operation, Func <CSOMOperation, Exception, CSOMOperation> handler)
{
operation.LogDebug("Fail handler set");
operation.SetFailHandler(handler);
//operation.OnFail = handler;
return(operation);
}