- Open the ‘Default.aspx.cs’ file. This file is a child node of the ‘Default.aspx’ node.
- Add the following code to the ‘Page_Load’ function:
if (!IsPostBack)
{
lblMessage.Text = "Insert Employee details";
DisplayAllEmployees();
}In addition, add the following functions in the same file:
protected void btnAdd_OnClick(object sender, EventArgs e)
{
if (txtEmployeeID.Text.Trim().Length > 0)
{
Employee newEmployee = new Employee();
newEmployee.FirstName = txtFirstName.Text;
newEmployee.ID = txtEmployeeID.Text;
newEmployee.LastName = txtLastName.Text;
if (!IsDuplicateOfExisting(newEmployee))
{
EntityManager em = PersistenceUtils.getEm();
em.GetTransaction().Begin();
try
{
em.Persist(newEmployee);
em.GetTransaction().Commit();
Response.Redirect("Default.aspx");
}
catch (Exception e1)
{
lblMessage.Text =
"<span style=\"color:red\">Problem during save</span><br />Please try again later.";
}
}
else
{
lblMessage.Text =
"<span style=\"color:red\">The ID you provided is already in use.</span><br />Please change the ID and try again.";
}
}
else
{
lblMessage.Text = "<span style=\"color:red\">The ID can't be empty</span>";
}
}
private bool IsDuplicateOfExisting(Employee newEmployee)
{
try
{
EntityManager em = PersistenceUtils.getEm();
Employee duplicateEmployee = em.Find<Employee>(typeof(Employee), newEmployee.ID);
return duplicateEmployee != null;
}
catch (Exception e)
{
return false;
}
}
protected void btnCancel_OnClick(object sender, EventArgs e)
{
Response.Redirect("Default.aspx");
}
private void DisplayAllEmployees()
{
EntityManager em = PersistenceUtils.getEm();
grdEmployees.DataSource = em.CreateQuery<Employee>("from Employee", typeof(Employee)).GetResultList();
grdEmployees.DataBind();
}
The web site is now ready! just run the web site by clicking F5.
