教你在c#中实现3层架构

    //tier and calls the Add method of business logic layer.

    private void cmdAdd_Click(object sender, System.EventArgs e)

    {

    try

    {

    cus = new BOCustomer();

    cus.cusID=txtID.Text.ToString();

    cus.LName = txtLName.Text.ToString();

    cus.FName = txtFName.Text.ToString();

    cus.Tel= txtTel.Text.ToString();

    cus.Address = txtAddress.Text.ToString();

    cus.Add();

    }

    catch(Exception err)

    {

    MessageBox.Show(err.Message.ToString());

    }

    }

    //This function gets the ID from the user and finds the

    //customer details and return the details in the form of

    //a dataset via busniss object layer. Then it loops through

    //the content of the dataset and fills the controls.

    private void cmdFind_Click(object sender, System.EventArgs e)

    {

    try

    {

    String cusID = txtID.Text.ToString();

    BOCustomer thisCus = new BOCustomer();

    DataSet ds = thisCus.Find(cusID);

    DataRow row;

    row = ds.Tables[0].Rows[0];

    //via looping

    foreach(DataRow rows in ds.Tables[0].Rows )

    {

    txtFName.Text = rows["CUS_F_NAME"].ToString();

    txtLName.Text = rows["CUS_L_NAME"].ToString();

    txtAddress.Text = rows["CUS_ADDRESS"].ToString();

    txtTel.Text = rows["CUS_TEL"].ToString();

    }

    }

    catch (Exception err)

    {

    MessageBox.Show(err.Message.ToString());

    }

    }

    //this function used to update the customer details.

    private void cmdUpdate_Click(object sender, System.EventArgs e)

    {

    try

    {

    cus = new BOCustomer();

    cus.cusID=txtID.Text.ToString();

    cus.LName = txtLName.Text.ToString();

    cus.FName = txtFName.Text.ToString();

    cus.Tel= txtTel.Text.ToString();

    cus.Address = txtAddress.Text.ToString();

    cus.Update();

    }

    catch(Exception err)

    {

    MessageBox.Show(err.Message.ToString());

    }

    }