Get ErrorMessage from Code Behind in .Net

Below Code is to get the error message from server side 

foreach (BaseValidator v in Page.Validators)

                {

                    if (!v.IsValid)

                    {

                        Response.Write(v.ErrorMessage);

                    }

                }

To Avoid Deadlock

 private static readonly object lockObject = new object();

lock (lockObject)
{

}