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Click the Browse button, and select the Northwind.mdf file from the location to which you copied it. In my case, I copied the database files to the C:\Northwind directory. Click OK when you have selected the file; there is no need to change the other settings on this screen. Now that we have created a new database connection, we return to the Choose Your Data Connection screen, as shown by Figure 30-6, which has been populated with the details we need. Ensure that the Save entity connection settings check box is checked. This will store the details of our connection in our project, which will make things easier for us to change if we want to connect to a different database, for example, a test or production system. Click the Next button.

Just as you can combine numeric expressions into more complex and powerful expressions, C# provides operators that let you combine Boolean expressions to test multiple conditions. The && operator combines two Boolean expressions into a single expression that s true only if both conditions are true. In our race example, we might use this to hide the low-fuel warning if we re near the end of the race and the car has enough fuel to make it to the finish line. Imagine that we added an extra argument to pass in the number of remaining laps in the race, and an additional variable to hold that value; we could write:

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The System.ComponentModel.IEditableObject interface is used by the Windows Forms data binding infrastructure to control undo operations in two cases: If an object is a child of a collection and is being edited in a grid control, the IEditableObject interface will be used so that the user can start editing a row of the grid (that is, the object) and then press Esc to undo any edits he has made on the row. When binding controls from a Windows Form to an object s properties, the IEditableObject interface will be used to tell the object that editing has started. It will not be used to tell the object when editing is complete, or whether the user requests an undo. It s up to the UI code to handle these cases. When using data binding to bind an object to a form, you can allow the data binding infrastructure to tell the object that editing has started. I typically don t rely on that feature, preferring to call BeginEdit() myself. Since I have to call CancelEdit() and ApplyEdit() manually anyway, I prefer simply to control the entire process.

As we saw in the previous section, the view controller hands off three responsibilities to the view: displaying a picture, responding to touch events, and clearing the drawing. We re going to step through these functions one at a time. Listing 19.8 shows what s done when a user picks an image.

query will still be making repeated executions of the subquery I want to find a way to avoid the repeated executions Also notice that the subquery is against the same table I m accessing in the outer query So the primary question I d want to consider is Can I write this query differently to avoid multiple accesses against the same table over and over Right now, the way the query is written, there s not much that can be done to make it scale very well It may perform okay now, but what about when the volume of data grows Listing 7-14 shows what happens if I double the table size to 50 rows Listing 7-14.

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