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Whew! That s quite bit of code to be added in one go, but don t panic; it s all rather straightforward when you know what it s meant to do. The purpose of listing 4.3 is to update a new sequence, called clashes, which holds a flag set to true if a given cell currently conflicts with others and false if it does not. The UI can then bind to this sequence, changing the way a grid cell is displayed to warn the player of any duplicates. The function update() clears the clashes sequence and then checks each group in turn. In our basic 9 x 9 puzzle there are 27 groups: nine rows, nine columns, and nine boxes. Each group has nine positions it needs to check for duplicates. However, most of the work is deferred to the function checkGroup(), which handles the checking of an individual group. Let s take a closer look at this function, so we can understand how it fits into update().

SqlDataReader reader = ExecuteSprocCommand.ExecuteReader(); while (reader.Read()) {

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for (int i = 0; i<reader.FieldCount;i++)

In the Report Designer, click the Design tab. Select the TextBox3 element, which is the last row and last column of the matrix element. In the Properties window, select the Number, Format property, and then type the value $#,#.##. Select the ProductSubCategory box, which is the last row and first column of the matrix element. In the Properties window, expand the Size property, and then change Width to 2in. Preview the report, noting the changes.

Group checking up close: function types Here s the checkGroup() function we re looking at, reproduced on its own to refresh your memory and save ambiguity:

In this exercise, you continue your modifications by adding a page footer that displays the user name for the report and page numbers.

results.Append(reader[i].ToString() + "\t"); } results.Append(Environment.NewLine); }

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function checkGroup ( group:Integer , func:function(:Integer,:Integer):Integer ) : Void { var freq = for(a in [0..gridDim]) 0; for(pos in [0..<gridDim]) { var val = grid[ func(group,pos) ]; if(val > 0) { freq[val]++; } } for(pos in [0..<gridDim]) { var idx = func(group,pos); var val = grid[idx]; clashes[idx] = clashes[idx] or (freq[val]>1); } }

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reader.Close();

In the Report Designer, click the Design tab. On the Report menu, select Add Page Footer. A new design area is added to the Report Designer. Drag a Textbox report item from the Toolbox window to the page footer area. Position the text box in the top-left corner of the footer. Configure the properties of the text box, as shown in the following table.

The first four lines are the function s signature; unfortunately it s quite long, so I split it over four separate lines in an attempt to make it more readable. You can see the function is called checkGroup, and it accepts two parameters: an Integer and a function type. The function type accepts two Integer variables and gives a single Integer in return. The Void on the end signifies checkGroup() has no return value. So, why do we need to pass a function to checkGroup() Think about it: when we re checking each position in a row group we re working horizontally across the grid, when we re checking each position in a column group we re working vertically down the grid, and for a box group we re working line by line within a portion of the grid. Figure 4.6 demonFigure 4.6 Coordinate translations for column, row, and box groups strates this.

ExecuteSprocCommand.Connection.Close();

In the Report Data window, expand Built-in Fields. (If the window is not visible, open it from the View menu by choosing Report Data.) Drag the User ID field to the txtUser box. BIDS creates the full expression for you. You can verify the full expression by rightclicking the text box and then clicking Expression. Drag another Textbox report item from the Toolbox window to the page footer area. Position the text box in the bottom-left corner of the footer, under the UserId box, as Figure 10-2 shows.

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We have three different ways of translating group and position to grid coordinates:

ResultsTextBox.Text = results.ToString();

Type page: in the txtPage box. (Important: Be sure to type a colon and a space following the label text.) Drag the Page Number field after the space following the colon. Type of (with a space before and after the text) after the Page Number field, and then drag the Total Pages field to the end of the expression.

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