barcode in asp net core

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Poorly scaled models (models where the typical values of the problem s objective and its constraints differ by several orders of magnitude) are one of the most common reasons why Solver appears to stop early without reaching a true optimal solution Therefore, it is a good idea to select the Use Automatic Scaling box if you think you re working with a poorly scaled model Show Iteration Results: This check box has Solver pause, display the Show Trial Solution dialog box, and show its interim results, for each calculation of the current problem Estimates: This area specifies the approach used to obtain initial estimates of the basic variables in each one-dimensional search Choose the Tangent option if you know you have a linear problem to solve The Tangent option instructs Solver to use an algorithm that performs a linear extrapolation from a tangent vector, and therefore favors linear problems.

SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT * FROM Products WHERE ProductID=@ProductID"> <SelectParameters> <asp:ControlParameter ControlID="lstProduct" Name="ProductID" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> You always indicate parameters with an @ symbol, as in @City You can define as many symbols as you want, but you must map each provider to another value In this example, the value for the @ProductID parameter comes from the lstProductSelectedValue property In other words, you are binding a value that s currently in a control to place it into a database.

Listing 11-3. Some Auth Parameters in the beforeFilter() Action 1 2 3 4 5 function beforeFilter() { $this->Auth->loginAction = array('controller'=>'users','action'=>'login'); $this->Auth->allow('index','view'); $this->Auth->redirectLogin = array('controller'=>'posts','action'=>'add'); }

command. (You could also use the SelectedText property to get the currently displayed text, which is the ProductName in this example.) Now all you need to do is bind the SqlDataSource to the remaining controls where you want to display information. This is where the example takes a slightly different turn. In the previous version of the record editor, you took the information and used a combination of values to fill in details in a label and a list control. This type of approach doesn t work well with data source controls. First, you can bind only a single data field to most simple controls such as lists. Second, each bound control makes a separate request to the SqlDataSource, triggering a separate database query. This means if you bind a dozen controls, you ll perform the same query a dozen times, with terrible performance. You can alleviate this problem with data source caching (see 26), but it indicates you aren t designing your application in a way that lends itself well to the data source control model. The solution is to use one of the rich data controls, such as the GridView, DetailsView, or FormView. These controls have the smarts to show multiple fields at once, in a highly flexible layout. You ll learn about these three controls in detail in the next chapter, but the following example shows a simple demonstration of how to use the DetailsView. The DetailsView is a rich data control that s designed to show multiple fields in a data source. As long as its AutoGenerateRows is True (the default), it creates a separate row for each field, with the field caption and value. Figure 16-12 shows the result.

Figure 16-12. Displaying full product information in a DetailsView Here s the basic DetailsView tag that makes this possible: <asp:DetailsView ID="detailsProduct" runat="server" DataSourceID="sourceProductDetails" />

As you can see, the only property you need to set is DataSourceID. That binds the DetailsView to the SqlDataSource you created earlier. This SqlDataSource gets the full product information for a single row, based on the selection in the list control. Best of all, this whole example still hasn t required a line of code.