2: Building Web Applications in .NET

Draw QR Code 2d barcode in .NET 2: Building Web Applications

2: Building Web Applications
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<td id="tdAddress" runat="server" style="width:200px"> </td> </tr> </table>
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This is a fairly straightforward HTML table. In the left column, type Category in the first row, SubCategory in the second, and Mailing Address in the third row. In the right column, place a Label control in the first row with an ID but with its Text property set to an empty string. You ll fill that at run time. In the second row, insert a TextBox control that has its ReadOnly property set to true, so that the user cannot type into the text box (you re using it for display only). The third row s second column is a bit unusual; the <td> itself has both an id and a runat attribute, meaning that you can modify the column itself programmatically. If you want to populate the Summary table, you ll need to perform a postback to evaluate and process the code (as discussed in 1). To do that, you ll need a Submit button. In Design view, drag a Button control onto the page just below the Summary table. Change its ID to btnSubmit, and its text to Submit. The Submit button s Click event handler will populate the Text of the Label and of the text button, and will set the inner HTML of the third row s second column. Double-click the Submit button from Design view, and you ll be automatically taken to the Click event handler in the code behind file. Add the following code to wire up the functionality:
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Protected Sub btnSubmit_Click( _ ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles btnSubmit.Click CategoryLabel.Text = ddlCategory.SelectedItem.Text SubCategoryTextBox.Text = lbSubCategory.SelectedItem.Text Dim strMailingAddress As String strMailingAddress = txtName.Text + "<br/>" + _ txtAddress.Text + "<br/>" + _ txtCity.Text + ", " + _ ddlState.SelectedValue + " " + _ txtZip.Text tdAddress.InnerHtml = strMailingAddress End Sub
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Let s take a closer look at this code. The event handler retrieves the selected item from the drop down list for Categories (ddlCategory) and asks it for its Text property, which it then assigns to the Text property of the CategoryLabel:
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CategoryLabel.Text = ddlCategory.SelectedItem.Text
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Similarly, the text is retrieved from the SelectedItem property of the ListBox that holds the SubCategory, and that text is assigned to the Text property of the read-only TextBox:
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SubCategoryTextBox.Text = lbSubCategory.SelectedItem.Text
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Controls
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Finally, and this is a bit tricky, the text of the various address fields are retrieved (including the selected value from the state drop-down), concatenated into a single string, and assigned to the local variable strMailingAddress. That value is then assigned to the InnerHtml property of tdAddress. This is, you ll remember, the ID assigned to the second <td> tag of the third row. The net result is that the cell is filled with the address string.
Dim strMailingAddress As String strMailingAddress = txtName.Text + "<br/>" + _ txtAddress.Text + "<br/>" + _ txtCity.Text + ", " + _ ddlState.SelectedValue + " " + _ txtZip.Text tdAddress.InnerHtml = strMailingAddress
VB CHEAT SHEET
Variables and Strings
In the first two examples in this section, you simply assigned the Text property of one control to the Text property of another control; that s easy enough. But for the third control, you took the Text properties of several controls, joined them together, and assigned them as a whole. The trick to this is using a variable. Simply put, a variable is like a bucket in your code, which can be used to hold a value. You can retrieve the value later, change it, or replace it with another value. You don t need to worry about what the value is when you re writing your code; you just need to know the name of the variable. In this case, you re using a variable called strMailingAddress to hold the text of the user s address. In VB, you create a new variable using the Dim statement, followed by the name you want to give the variable:
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