How can i make my data in microsoft access persistent using ado.net wpf ?

See more:

C#

ADO.NET

WPF

i have a porblem ,
I connected my wpf project to a microsoft access to insert and retreive data to the database .
when i open my project to insert data , then i can preview the data in another windnow , there is no problem untli the next point .
when i open my project again i can't retrieve the previous data which were entered .

And this is part ot the insert code :

OleDbConnection oConn = new OleDbConnection(ConnSt);
try
{
    OleDbCommand oComm = new OleDbCommand(
         "insert into MyData(CLName,CLAge,CLMajor) values('"
         + clientName.Text
         + "','" 
         + clientAge.Text 
         + "','"
         + ClientMajor.Text
         + "'")
    , oConn);
    oConn.Open();
    oComm.ExecuteNonQuery();
    oConn.Close();
}
catch (Exception exepc)
{
    MessageBox.Show(" There is a problem," + exepc.ToString());
}

Can you help me ? :confused:

Thank you in advance.