Update is not taking place in C1Datagrid in WPF

See more:

C#

WPF

C#4.0

DataGrid

using C1.WPF.DataGrid;

        public static OleDbConnection connection;
        public static OleDbDataAdapter da;       
        
        public static DataSet ds = new DataSet();
        public static DataTable dt;
        OleDbCommandBuilder cmd;

        public static string connectionstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:/Project/A&T.accdb";
        public static string cmdstring;
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            cmdstring = "SELECT*FROM DP";
            connection = new OleDbConnection(connectionstring);
            connection.Open();
            da = new OleDbDataAdapter(cmdstring, connection);
            dt = new DataTable();
            da.Fill(dt);         
            

            c1DataGrid1.DataContext = dt;    

        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {    


            cmd = new OleDbCommandBuilder(da);
            dt.GetChanges();
            if (dt.GetChanges() != null)
            {
                da.Update(dt);
            }
            dt.AcceptChanges();

            
           
        }

in this code i use a third party product Component one Datagrid.the problem is while clicking Button2 the change should be updated back to the database. this is not happening.if I replace the c1DataGrid1 with Datagrid of WPF everything working fine what should i do. any sort of help will be appreciated

update is happening only when a cell in any other row is clicked . otherwise it is not happening I want to avoid this situation

Regards

Iqbal