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// Display status statusLabel.Text = success "<br />Product successfully removed!<br />" : "<br />There was an error removing the product!<br />"; // Repopulate the control PopulateControls(); } 3. In ShoppingCart.aspx, double-click the Update Quantities button and complete the automatically generated code like this: // update shopping cart product quantities protected void updateButton_Click(object sender, EventArgs e) { // Number of rows in the GridView int rowsCount = grid.Rows.Count; // Will store a row of the GridView GridViewRow gridRow; // Will reference a quantity TextBox in the GridView TextBox quantityTextBox; // Variables to store product ID and quantity string productId; int quantity; // Was the update successful bool success = true; // Go through the rows of the GridView for (int i = 0; i < rowsCount; i++) { // Get a row gridRow = grid.Rows[i]; // The ID of the product being deleted productId = grid.DataKeys[i].Value.ToString(); // Get the quantity TextBox in the Row quantityTextBox = (TextBox)gridRow.FindControl("editQuantity"); // Get the quantity, guarding against bogus values if (Int32.TryParse(quantityTextBox.Text, out quantity)) { // Update product quantity success = success && ShoppingCartAccess.UpdateItem(productId, quantity); } else { // if TryParse didn't succeed success = false; }

If you want really rich text, you should have raw resources containing HTML, and then pour those into a WebKit widget. However, for light HTML formatting, using <b>, <i>, and <u>, you can just use a string resource. The catch is that you must escape the HTML tags, rather than treating them normally:

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You will understand and recognize most of the code in this project from previous projects. I ll just point out the new keywords and concepts: unsigned long changeTime; Here is a new data type for a variable. Previously, you created integer data types, which can store a number between -32,768 and 32,767. This time you created a data type of long, which can store a number from -2,147,483,648 to 2,147,483,647. However, you have specified an unsigned long, which means the variable cannot store negative numbers, so the range is from 0 to 4,294,967,295. If you use an integer to store the length of time since the last change of lights, you would only get a maximum time of 32 seconds before the integer variable reached a number higher than it could store. As a pedestrian crossing is unlikely to be used every 32 seconds, you don t want your program crashing due to your variable overflowing when it tries to store a number too high for the variable data type. So you use an unsigned long data type to get a huge length of time in between button presses: 4294967295 * 1ms = 4294967 seconds 4294967 seconds = 71582 minutes 71582 minutes - 1193 hours 1193 hours - 49 days It s pretty inevitable that a pedestrian crossing button will be pressed at least once in 49 days, so you shouldn t have a problem with this data type.

// Display status message statusLabel.Text = success "<br />Your shopping cart was successfully updated!<br />" : "<br />Some quantity updates failed! Please verify your cart!<br />"; } // Repopulate the control PopulateControls(); }

Yep, this was interesting all right. Allowing the visitor to edit multiple GridView entries at once is certainly very useful. Take a close look at the code and make sure you understand how the GridView is parsed, how the proper TextBox controls is found, and how its value is read. Then, the ShoppingCartAccess class is simply used to update the product quantities. When reading the values from the TextBox controls and converting them to integers, you use a new .NET 2.0 feature called TryParse. This static method of the Int32 class (you can find it in other similar classes, too) is similar to Parse, but doesn t throw an exception if the conversion cannot be done which can easily happen if the visitor enters a letter instead of a number in the quantity box, for example. TryParse returns a bool value representing the success of the operation and returns the converted value as an out parameter: // Get the quantity, guarding against bogus values if (Int32.TryParse(quantityTextBox.Text, out quantity)) The ShoppingCartAccess.UpdateItem method also returns a bool value specifying whether the update completed successfully or not. Should either this method or TryParse return false, you set the value of the success variable to false. If after processing all rows, the value of success is false, you inform the visitor that at least one of the rows couldn t be updated. If ShoppingCartAccess.UpdateItem generates a database error for some reason, the error is logged using the log mechanism that you implemented in 4 if you enabled the error-handling routine, that is because it can be disabled by changing an option in web.config.

<resources> <string name="b">This has <b>bold</b> in it.</string> <string name="i">Whereas this has <i>italics</i>!</string> </resources>

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