Restore database from other computer

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C#

C#3.5

SQL-Server-2008R2

Hi everyone, i'm building an application, it can backup and restore database from sql server, but it doesn't work when i remote to other computer.
I want to built an application to remote other computer by 'conectionsString" to restore database from other machine such as "Locate Backup File" form in SMO

This code restore database from my computer, it doesn't when remote to other computer

private void btnRestore_Click(object sender, EventArgs e)
       {
           if (srvSql != null)
           {
               if (openBackupDialog.ShowDialog() == DialogResult.OK)
               {
                   Restore rstDatabase = new Restore();
                   rstDatabase.Action = RestoreActionType.Database;
                   rstDatabase.Database = cmbDatabase.SelectedItem.ToString();
                   BackupDeviceItem bkpDevice = new
                   BackupDeviceItem(openBackupDialog.FileName, DeviceType.File);
                   rstDatabase.Devices.Add(bkpDevice);
                   rstDatabase.ReplaceDatabase = true;
                   rstDatabase.SqlRestore(srvSql);
               }
           }
           else
           {
               MessageBox.Show("A connection to a SQL server was not established.", "Not Connected to Server", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
           }