Problem in Restoring Database

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C#

When i’m doing restore DB then following error occur,Please help me to resolve this error.
Exclusive access could not be obtained because the database is in use.RESTORE DATABASE is Terminating Abnormally

My Code For Restoring DB is-

public static void RestoreDB(string backUpFilePath, string databaseName)
        {
            try
            {
                Restore restore = new Restore();
                restore.Database = databaseName;

                restore.Action = RestoreActionType.Database;
                restore.Devices.AddDevice(backUpFilePath, DeviceType.File);
                restore.ReplaceDatabase = true;
                restore.NoRecovery = false;
                restore.RelocateFiles.Add(new RelocateFile("DB_Jaggery", @"C:\Temp\DB_jaggry.mdf"));
                restore.RelocateFiles.Add(new RelocateFile("DB_Jaggery_log", @"C:\Temp\DB_Jaggry_log.ldf"));
                ServerConnection connection = new ServerConnection(@"SNEHA-PC\SQLEXPRESS");
                Server sqlServer = new Server(connection);
                restore.SqlRestore(sqlServer);
                MessageBox.Show("Restore operation succeeded");
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.ToString());
            }
        }

Thank u in Advance..