string strAccessConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\dlanfragen.accdb;Persist Security Info=True";//OutlookAddDLabfragen.Properties.Settings.Default.dlanfragenConnectionString ;

string strAccessSelect = "SELECT * FROM dta";

// Create the dataset and add the Categories table to it:

dlanfragenDataSet dl = new dlanfragenDataSet();

OleDbConnection myAccessConn = null;

myAccessConn = new OleDbConnection(strAccessConn);

OleDbCommand myAccessCommand = new OleDbCommand(strAccessSelect, myAccessConn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(myAccessCommand);

// myAccessConn.Open();
myDataAdapter.Fill(dl);

//var p = from c in dl.dta.AsQueryable()
// select c;


dlanfragenDataSet.dtaRow row = dl.dta.NewdtaRow();

row._Kaufmännische_Software_ = "test1";
row._Kalkulations_Software_ = "test1"
row._Datenaustausch_Schnittstelle_ = "test1";

row.ID = dl.dta.Count + 1;

dl.dta.AdddtaRow(row);

myDataAdapter.Update(dl );
dl.AcceptChanges();