using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Collections;

namespace GridViews

{

public partial class GridViewExample7 : System.Web.UI.Page

{

private const int PRODUCTID_COLUMN = 0;

private const int PRICE_COLUMN = 2;

private const int FIRST_CONTROL = 0;

ArrayList arrProducts = new ArrayList();

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

GenerateArrayList();

Session["Products"] = arrProducts;

ShowProducts();

}

}

public void ShowProducts()

{

arrProducts = (ArrayList)Session["Products"];

gvProducts.DataSource = arrProducts;

gvProducts.DataBind();

}

public void GenerateArrayList()

{

Product objProduct;

for (int i = 1; i <= 6; i++)

{

objProduct = new Product();

objProduct.ProductID = (100 + i).ToString();

objProduct.Description = "Product " + i.ToString();

objProduct.Price = 3.5 * i;

objProduct.QOH = 5 * i;

arrProducts.Add(objProduct);

}

}

// CommandField Select Button event handling code

// Double-click on the select button to add this event handler

protected void gvProducts_SelectedIndexChanged(object sender, EventArgs e)

{

// Retrieve and display the value contained in the

// BoundField for ProductNumber (column index 0) of the row the button was clicked

lblDisplay.Text = "ProductNumber: " + gvProducts.SelectedRow.Cells[PRODUCTID_COLUMN].Text;

}

// RowEditing event handler that fires when the CommandField Edit button is clicked.

// There is no double-click that will produce this handler

protected void gvProducts_RowEditing(Object sender, System.Web.UI.WebControls.GridViewEditEventArgs e)

{

// Set the row to edit-mode in the GridView

gvProducts.EditIndex = e.NewEditIndex;

ShowProducts();

lblDisplay.Text = "";

}

// RowUpdating event handler that fires when the CommandField Update button is clicked.

// There is no double-click that will produce this handler

protected void gvProducts_RowUpdating(Object sender, System.Web.UI.WebControls.GridViewUpdateEventArgs e)

{

// retrieve the row index for which the Update button was clicked

// and retrieve the ProductNumber from the first column (BoundField) in that row.

int rowIndex = e.RowIndex;

String prodNum = gvProducts.Rows[rowIndex].Cells[PRODUCTID_COLUMN].Text;

// Retrieve the Product object the selected row refers to in the arraylist

arrProducts = (ArrayList)Session["Products"];

Product objProduct = (Product)arrProducts[rowIndex];

// Retrieve a reference to the TextBox in the row for the quantity to add

TextBox TBox;

TBox = (TextBox)gvProducts.Rows[rowIndex].FindControl("txtQtyAdd");

int quantity = int.Parse(TBox.Text);

// Retrieve a reference to a TextBox created by the GridView when it's in edit-mode

TBox = (TextBox)gvProducts.Rows[rowIndex].Cells[PRICE_COLUMN].Controls[FIRST_CONTROL];

double price = double.Parse(TBox.Text);

// Update the object and update the arraylist stored in the Session

objProduct.Price = price;

objProduct.QOH = objProduct.QOH + quantity;

Session["Products"] = arrProducts;

lblDisplay.Text = "Product " + prodNum + " has been updated.";

// Set the GridView back to the original state.

// No rows currently being edited.

gvProducts.EditIndex = -1;

ShowProducts();

}

// RowCancelingEdit event handler that fires when the CommandField Cancel button is clicked.

// There is no double-click that will produce this handler

protected void gvProducts_RowCancelingEdit(Object sender, System.Web.UI.WebControls.GridViewCancelEditEventArgs e)

{

// Set the GridView back to the original state

// No rows currently being editted

gvProducts.EditIndex = -1;

ShowProducts();

lblDisplay.Text = "";

}

}

}