Backup database in c#

try
    {
        string command = @"BACKUP DATABASE DBDemo TO DISK='"+ strFileName+"'";
        SqlCommand oCommand = null;
        SqlConnection oConnection = null;
        oConnection = new SqlConnection("Data Source=MYPC/SQLEXPRESS;Initial Catalog=DBDemo;Integrated Security=True");
        if (oConnection.State != ConnectionState.Open)
        oConnection.Open();
        oCommand = new SqlCommand(command, oConnection);
        oCommand.ExecuteNonQuery();


    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }