public void Update()
        {
            //create an instance of the Inventory Collection
            clsReviewCollection AllReviews = new clsReviewCollection();
            //validate the data on the Windows Form
            string Error = AllReviews.ThisReview.Valid(txtEmail.Text, txtDescription.Text, txtDateReviewed.Text, Convert.ToString(comboBoxRating.SelectedItem), txtProductId.Text);

            //if the data is OK then add it to the object
            if (Error == "")
            {
                //find the record to UPDATE
                AllReviews.ThisReview.Find(mReviewId);
                //get the data entered by the user

                AllReviews.ThisReview.Email        = Convert.ToString(txtEmail.Text);
                AllReviews.ThisReview.Description  = Convert.ToString(txtDescription.Text);
                AllReviews.ThisReview.DateReviewed = Convert.ToDateTime(txtDateReviewed.Text);
                AllReviews.ThisReview.Rating       = Convert.ToInt32(comboBoxRating.SelectedItem);
                AllReviews.ThisReview.ProductId    = Convert.ToInt32(txtProductId.Text);


                //UPDATE the record
                AllReviews.Update();
                //All Done so Redirect to the previous Form
                ReviewManageForm RM = new ReviewManageForm();
                this.Hide();
                RM.ShowDialog();
                this.Close();
            }
            else
            {
                lblError.Text = "There were problems with the data entered: " + Error;
            }
        }
        void Add()
        {
            //create an instance of the Inventory Collenction
            clsReviewCollection AllReviews = new clsReviewCollection();
            //validate the data on the web form
            string Error = AllReviews.ThisReview.Valid(txtEmail.Text, txtDescription.Text, txtDateReviewed.Text, Convert.ToString(comboBoxRating.SelectedItem), txtProductId.Text);

            //if the data is OK then add it to the object
            if (Error == "")
            {
                //get the data entered by the user
                AllReviews.ThisReview.Email        = Convert.ToString(txtEmail.Text);
                AllReviews.ThisReview.Description  = Convert.ToString(txtDescription.Text);
                AllReviews.ThisReview.DateReviewed = Convert.ToDateTime(txtDateReviewed.Text);
                AllReviews.ThisReview.Rating       = Convert.ToInt32(comboBoxRating.SelectedItem);
                AllReviews.ThisReview.ProductId    = Convert.ToInt32(txtProductId.Text);

                //add the record
                AllReviews.Add();
                //all done so redirect back to the main page
                ReviewManageForm RM = new ReviewManageForm();
                this.Hide();
                RM.ShowDialog();
                this.Close();
            }
            else
            {
                //report an error
                lblError.Text = "There were problems with the data entered : " + Error;
            }
        }
        private void btnReviewManage_Click_1(object sender, EventArgs e)
        {
            ReviewManageForm RM = new ReviewManageForm();

            this.Hide();
            RM.ShowDialog();
            this.Close();
        }
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        private void btnNo_Click(object sender, EventArgs e)
        {
            //redirect to the main form
            ReviewManageForm RM = new ReviewManageForm();

            this.Hide();
            RM.ShowDialog();
            this.Close();
        }
        private void btnCancel_Click(object sender, EventArgs e)
        {
            //create an instance of ManageInventoryForm
            ReviewManageForm RM = new ReviewManageForm();

            //hide the current form
            this.Hide();
            //show the Manaage Inventory Form
            RM.ShowDialog();
            //close the current form
            this.Close();
        }
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        private void btnYes_Click(object sender, EventArgs e)
        {
            string            message = "The Review has been deleted successfully.";
            string            caption = "Deletion Confirmation";
            DialogResult      result;
            MessageBoxButtons button = MessageBoxButtons.OK;

            result = MessageBox.Show(message, caption, button);

            if (result == DialogResult.OK)
            {
                //delete the record
                DeleteInventory();
                //redirect to the main form
                ReviewManageForm RM = new ReviewManageForm();
                this.Hide();
                RM.ShowDialog();
                this.Close();
            }
        }
        private void btnOK_Click(object sender, EventArgs e)
        {
            clsReviewCollection AllReviews = new clsReviewCollection();
            string            Error        = AllReviews.ThisReview.Valid(txtEmail.Text, txtDescription.Text, txtDateReviewed.Text, Convert.ToString(comboBoxRating.SelectedItem), txtProductId.Text);
            string            message      = "Are you sure to Add the new Review to the Database?";
            string            caption      = "User Confirmation!";
            MessageBoxButtons buttons      = MessageBoxButtons.YesNo;
            DialogResult      result;

            //Displays the MessageBox

            //if there are no Errors returned
            if (Error == "")
            {
                //show the Message box
                result = MessageBox.Show(message, caption, buttons);

                //if "Yes" is pressed
                if (result == DialogResult.Yes)
                {
                    //execute the Update method
                    Add();

                    //create an instance of ManageInventoryForm
                    ReviewManageForm RM = new ReviewManageForm();
                    //hide the current form
                    this.Hide();
                    //show the Manaage Inventory Form
                    RM.ShowDialog();
                    //close the current form
                    this.Close();
                }
            }

            else
            {
                //report an error
                lblError.Text = "There were problems with the data entered : " + Error;
            }
        }