// Button Issue Book
private void Button_IssueBook_Click(object sender, EventArgs e)
{
if (this.textBox_StudentName.Text != string.Empty && this.comboBox_Books.SelectedIndex != -1)
{
string enrollmentNo = this.textBox_EnrollmentNo.Text.Trim();
int bookId = int.Parse(this.comboBox_Books.SelectedValue.ToString());
IssueBook issueBook = new IssueBook();
if (!issueBook.IsBookAlreadyIssued(enrollmentNo, bookId, out string errorMessage))
{
if (!issueBook.CanStudentTakeMoreBooks(enrollmentNo, out errorMessage))
{
if (issueBook.GiveABook(enrollmentNo, bookId, out errorMessage))
{
MessageBox.Show(errorMessage,
"Issue Book",
MessageBoxButtons.OK,
MessageBoxIcon.Information);
ClearStudentData();
}
else
{
MessageBox.Show(errorMessage,
"Issue Book",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
}
else
{
MessageBox.Show(errorMessage,
"Issue Book",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
}
else
{
MessageBox.Show(errorMessage,
"Issue Book",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
}
else
{
MessageBox.Show("No Student selected or no Book found!",
"Issue Book",
MessageBoxButtons.OK,
MessageBoxIcon.Warning);
}
}
