[2.0] c# ado.net

[arshesander]

why this code doesnt work?

string ConStr = "Provider=Microsoft.Jet.OleDB.4.0; Data Source =" + Application.StartupPath + "\\Employee.mdb";
OleDbConnection Conn = new OleDbConnection(ConStr);

Conn.Open();

OleDbCommand Cmd = new OleDbCommand("Select * from Employee", Conn);
OleDbDataAdapter dAdapter = new OleDbDataAdapter(Cmd);
DataSet dDataSet = new DataSet();

DataRow AddNewRow = dDataSet.Tables["Employee"].NewRow();
AddNewRow["EmployeeID"] = textBox1.Text;
AddNewRow["EmployeeName"] = textBox2.Text;

dDataSet.Tables["Employee"].Rows.Add(AddNewRow);
dAdapter.Update(dDataSet, "Employee");

Conn.Close();

Use the "new" keyword to create an object instance.

[effekt26]

why this code doesnt work?

string ConStr = "Provider=Microsoft.Jet.OleDB.4.0; Data Source =" + Application.StartupPath + "\\Employee.mdb";
OleDbConnection Conn = new OleDbConnection(ConStr);

Conn.Open();

OleDbCommand Cmd = new OleDbCommand("Select * from Employee", Conn);
OleDbDataAdapter dAdapter = new OleDbDataAdapter(Cmd);
DataSet dDataSet = new DataSet();

DataRow AddNewRow = dDataSet.Tables["Employee"].NewRow();
AddNewRow["EmployeeID"] = textBox1.Text;
AddNewRow["EmployeeName"] = textBox2.Text;

dDataSet.Tables["Employee"].Rows.Add(AddNewRow);
dAdapter.Update(dDataSet, "Employee");

Conn.Close();

Use the "new" keyword to create an object instance.

What error are you getting?? If any??

try changing your code to incorporate a using block, and a try catch block...

string ConStr = "Provider=Microsoft.Jet.OleDB.4.0; Data Source =" + Application.StartupPath + "\\Employee.mdb";
using (OleDbConnection Conn = new OleDbConnection(ConStr)) {

            try {

            Conn.Open();

            OleDbCommand Cmd = new OleDbCommand("Select * from Employee", Conn);
            OleDbDataAdapter dAdapter = new OleDbDataAdapter(Cmd);
            DataSet dDataSet = new DataSet();

            DataRow AddNewRow = dDataSet.Tables["Employee"].NewRow();
            AddNewRow["EmployeeID"] = textBox1.Text;
            AddNewRow["EmployeeName"] = textBox2.Text;

            dDataSet.Tables["Employee"].Rows.Add(AddNewRow);
            dAdapter.Update(dDataSet, "Employee");

            } catch (Exception ex) {
                 throw new Exception(ex.Message);
            }
}

This will intantiate your OleDbConnection object, and at the close of the block, it will properly close and dispose the object...

The try {} catch{} will catch an an error, and throw a new exception...