winforms pdf 417

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Debugging a data structure like a spreadsheet is a fairly complex task, because there is too much data. The Worksheet<> class implements the ToString() method and generates a string. The string can be retrieved and then displayed using a method like Console.WriteLine(). But there is another reason you should, as a rule, always implement ToString(): the Visual Studio IDE uses it. Let s say that you are writing the following code that uses an IWorksheet<> instance. IWorksheetBase sheet = SpreadsheetManager.CreateEmpytWorksheet<double>(""); sheet.Dimension(10, 10); sheet.AssignCellState(0, 0, "10.0"); You would like to check if the first cell row and column item have been assigned a value of 10. To check the state, you would compile the source and set a breakpoint immediately after the AssignCellState() call. Then in the IDE, look in the Locals window and inspect the state of sheet, as shown in Figure 11-3.

Excel can combine the values of several independent groups of cells into a single group, a technique known as consolidating data. For example, given four worksheets of yearly sales data from geographical regions (such as North, South, East, and West), you could consolidate this sales data into a single region-wide sales total worksheet for each of the geographical regions for all four years worth of sales combined, for easier and faster data analysis. Three common data consolidation techniques are available: Using 3-D references in formulas: 3-D references are references to cells that span two or more worksheets in a workbook. You can consolidate data using 3-D references in formulas for any type or arrangement of data (this is the preferred data-consolidation technique). By position: You can consolidate data by position if your data is in the same cell in several cell groups. By category: You can consolidate data by category if you have data in cell groups that each contain the same row or column labels.

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// Update category details public static bool UpdateCategory(string id, string name, string description) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogUpdateCategory"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CategoryId"; param.Value = id; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@CategoryName"; param.Value = name; param.DbType = DbType.String; param.Size = 50; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@CategoryDescription"; param.Value = description; param.DbType = DbType.String; param.Size = 1000; comm.Parameters.Add(param); // result will represent the number of changed rows int result = -1; try { // execute the stored procedure result = GenericDataAccess.ExecuteNonQuery(comm); }

Figure 11-3. Locals window that uses ToString() functionality In the Locals window, the first number beside sheet is 10, followed by a series of zeros. This value is the buffer generated by ToString() and provides a user-friendly way to investigate the contents of the variable.

catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); }

Note The ToString() method is useful only when debugging or trying to perform analysis of the state of an object without actually debugging the program. Thus, for improved debugging or runtime analysis, always implement ToString().

// Delete Category public static bool DeleteCategory(string id) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogDeleteCategory"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CategoryId"; param.Value = id; param.DbType = DbType.Int32; comm.Parameters.Add(param); // execute the stored procedure; an error will be thrown by the // database if the Category has related categories, in which case // it is not deleted int result = -1; try { result = GenericDataAccess.ExecuteNonQuery(comm); } catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); } 5. Finally, you ll create the AdminCategories Web Form. This exercise is very similar to the one in which you created the AdminDepartments Web Form. The exercise mainly consists of preparing the GridView and the other constituent controls and then implementing the code-behind functionality. Because you already have a GridView skin, you won t need to bother with that detail again here.

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