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Whether you are saving a file to disk or to a database, you should use a FileUpload control if your users only need to upload a single file from a page. Listing 11-6 shows how to acquire the content of the file from the FileUpload control and how to add it to a database.

Listing 11-6. Saving a Single File to the Database Imports System.Data.SqlClient Partial Class DatabaseFileUpload Inherits System.Web.UI.Page '*************************************************************************** Protected Sub btnUpload_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles btnUpload.Click If FileUploader.HasFile Then 'Create the database objects we need Dim dbConn As SqlConnection = Nothing Dim dbCmd As SqlCommand = Nothing 'Open the connection and set up the SQL statement dbConn = Data.GetConnection() dbCmd = New SqlCommand( _ "DELETE FROM [Files] WHERE [FileName]=@FileName;" & _ "INSERT INTO [Files] VALUES (@FileName, @FileSize, @FileData);", _ dbConn) 'Add values using parameters dbCmd.Parameters.AddWithValue("@FileName", _ System.IO.Path.GetFileName(FileUploader.FileName)) dbCmd.Parameters.AddWithValue("@FileSize", _ FileUploader.FileContent.Length) dbCmd.Parameters.AddWithValue("@FileData", FileUploader.FileBytes) 'Execute and close dbConn.Open() dbCmd.ExecuteNonQuery() dbConn.Close() End If End Sub End Class When a user clicks on the Upload button, the btnUpload_Click event handler executes. Its purpose is to save the file in the FileUploader control to the database. The method starts out by checking the HasFile property of the FileUploader control to determine if the user uploaded a file. If so, the method acquires a new database connection using the Data.GetConnection() utility function. This function acquires a connection to a SQL database connection using the Database connection string from the Web.config file. You can look at the source code for the function in the sample application in the Source Code area of the Apress Web site.

In theory, you could support removing individual items from the shopping cart. But, this is just a demonstration application and clearing the entire shopping cart is a much simpler task. To do so, add a link button to the ShoppingCartExample.aspx page, right under the gridShoppingCart control: <asp:LinkButton ID="linkClearShoppingCart" Runat="server" OnClick="linkClearShoppingCart_Click">Clear Shopping Cart</asp:LinkButton> Then add the code in Listing 6-24 to the code-behind file. Listing 6-24. Clearing the Shopping Cart '*************************************************************************** Sub linkClearShoppingCart_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles linkClearShoppingCart.Click If Not Profile.ShoppingCart Is Nothing Then Profile.ShoppingCart.Clear() End Sub

// x+w did not overflow and x+w is smaller than X+W if (w >= x && W > w) { return false; } } h += y; H += Y; if (H <= Y) { if (h >= y return } } else { if (h >= y return } } return true; } public boolean contains(int x, int y) { return inside(x, y); } public boolean inside(int X, int Y) { int w = this.width; int h = this.height; if ((w | h) < 0) { // At least one of the dimensions is negative... return false; } // Note: if either dimension is zero, tests below must return false... int x = this.x; int y = this.y; if (X < x || Y < y) { return false; } w += x; h += y; // overflow || intersect return ((w < x || w > X) && (h < y || h > Y)); } }

This method is called when exiting a context. This method adds the diagnostic context for the current thread. This method is called when exiting a thread. It removes the diagnostic context for the particular thread.

When you click on the Clear Shopping Cart link button, all the products in the shopping cart are removed, and you can start adding products anew.