//public ActionResult Edit([Bind(Include = "StudentId, StudentName")] Student std) // Using this form will only shows StudentId and StudentName.
public ActionResult Edit(Student std)
{
if (!ModelState.IsValid)
{
return(View(std));
}
if (std == null)
{
ModelState.AddModelError(string.Empty, "Student is NULL.");
return(View(std));
}
std.StudentName = std.StudentName.Trim();
// check whether name already exists in database.
bool nameAlreadyExists = StudentDao.StudentNameExists(std.StudentName, std.StudentId);
if (nameAlreadyExists)
{
ModelState.AddModelError(string.Empty, "Student Name already exists.");
return(View(std));
}
// Update database.
int i = StudentDao.UpdateRecord(std);
if (i == 1)
{
return(RedirectToAction("Index"));
}
else if (i < 1)
{
ModelState.AddModelError(string.Empty, "Fail to update it in database.");
return(View(std));
}
else
{
ModelState.AddModelError(string.Empty, "More than ONE record are updated in database.");
return(View(std));
}
}