private void btnSave_Click(object sender, EventArgs e)
        {

            //create = false;
            //Has max and min of year.
            NumericUpDown year = new NumericUpDown();

            year.Minimum = 1900;
            year.Maximum = 2017;


            //Below creates message boxes in case textboxes aren't filled with information.
            if (string.IsNullOrEmpty(txtTitle.Text))
            {
                MessageBox.Show("Enter a text title", "Error");
                txtTitle.Focus();
            }//Checks for ISBN.
            else if (txtISBN.Text.ToString().Length !=13)
            {
                MessageBox.Show("Enter a valid ISBN", "Error");
                txtISBN.Focus();
            }

            else if ( string.IsNullOrEmpty(txtYear.Text))
            {
               MessageBox.Show("Please enter a valid year", "Error");
                txtYear.Focus();
            }
         //It should allow nothing to be placed into the year but it doesn't work without it so I made users have to put in a valid year.
              else if (int.Parse(txtYear.Text) < year.Minimum || int.Parse(txtYear.Text) > year.Maximum )

                    {
                       MessageBox.Show("Enter a valid year", "Error");
                        txtYear.Focus();

            }
                //Checks for publisher
            else if( cmbPublisher.SelectedIndex == -1)
            {
                MessageBox.Show("Select a publisher", "Error");
                    cmbPublisher.Focus();
            }

            else
            {
                Exit = true;


                titlesBindingSource.EndEdit(); //Saves new data

                _books_Spring2017_A2DataSet.PublishersRow books;
                books = this._books_Spring2017_A2DataSet.Publishers[area];

                changeButtons();
                changeText();
                statusLabel();
                lblPublisher.Visible = false;
                cmbPublisher.Visible = false;
                stsInfo.Text = "";

                btnSave.Enabled = false;
                btnEdit.Enabled = true;
                btnAdd.Enabled = true;
                btnUndo.Enabled = false;
                btnDelete.Enabled = true;
                btnExit.Enabled = true;

                //Changes textboxes to read only.
                txtTitle.ReadOnly = true;
                txtISBN.ReadOnly = true;
                txtDescription.ReadOnly = true;
                txtSubject.ReadOnly = true;
                txtPages.ReadOnly = true;
                txtYear.ReadOnly = true;
                txtPrice.ReadOnly = true;

                try
                {
                    //Code here should be working but it crashes if you try adding something at the very end of the database.

                        try
                        {
                            books.Name = txtPublisher.Text;
                        }
                        catch
                        {
                            txtPublisher.Text = null;
                        }

                        try
                        {
                            books.Address = txtAddress.Text;
                        }
                        catch
                        {
                            txtAddress.Text = null;
                        }
                        try
                        {
                            books.City = txtCity.Text;
                        }
                        catch
                        {
                            txtCity.Text = null;
                        }
                        try
                        {
                            books.State = txtState.Text;
                        }
                        catch
                        {
                            txtState.Text = null;
                        }
                        try
                        {
                            books.Zip = txtZip.Text;
                        }
                        catch
                        {
                            txtZip.Text = null;
                        }
                    }


                //exceptions
                catch (StrongTypingException except)
                {
                    MessageBox.Show(except.Message, "Strong Typing Exeption");
                }

                try //Should update entire database and it works on one of my laptops but not the other.
                {
                    this.titlesTableAdapter.Update(this._books_Spring2017_A2DataSet.Titles);
                }
                catch (Exception except)
                {
                    MessageBox.Show(except.Message, except.GetType().ToString());
                }
            }

            }