winforms data matrix

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winforms data matrix

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4. Let s now write the methods that work with your new stored procedures: GetAllProductsInCategory, CreateProduct, and UpdateProduct. What is important to note is the error-handling strategies implemented in these methods. In the Get... methods, all errors are important enough to be signaled to the user with an oops message, so we don t catch them in the business tier. Here, errors with update- and create-type methods are more likely due to bad input data, so we prefer to signal with a friendlier error message. In these cases, we catch any potential exceptions to prevent them from propagating, and we return the success value as a bool value. The presentation tier decides what to tell the visitor depending on this value. Add the following code to your CatalogAccess class: // retrieve the list of products in a category public static DataTable GetAllProductsInCategory(string categoryId) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogGetAllProductsInCategory"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CategoryID"; param.Value = categoryId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // execute the stored procedure and save the results in a DataTable DataTable table = GenericDataAccess.ExecuteSelectCommand(comm); return table; } // Create a new product public static bool CreateProduct(string categoryId, string name, string description, string price, string Thumbnail, string Image, string PromoDept, string PromoFront) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogCreateProduct"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CategoryID"; param.Value = categoryId; param.DbType = DbType.Int32; comm.Parameters.Add(param);

Set the Top Row and Left Column check boxes as follows: If you re consolidating data by position, leave the Top Row and Left Column check boxes cleared..

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// create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductName"; param.Value = name; param.DbType = DbType.String; param.Size = 50; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductDescription"; param.Value = description; param.DbType = DbType.String; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@Price"; param.Value = price; param.DbType = DbType.Decimal; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@Thumbnail"; param.Value = Thumbnail; param.DbType = DbType.String; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@Image"; param.Value = Image; param.DbType = DbType.String; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@PromoDept"; param.Value = PromoDept; param.DbType = DbType.Boolean; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@PromoFront"; param.Value = PromoFront; param.DbType = DbType.Boolean; comm.Parameters.Add(param);

Here are some exercises that allow you to apply what you ve learned so far: 1. The Worksheet<> class always requires you to dimension the fixed-cell array ahead of time. Change this code so that the rows and columns can change dynamically. Remember that the focus is on performance, and the fastest approach is a fixed-dimension array. 2. The average calculation knows how many items there are by the row number. Rewrite the average calculation code so that the user of the average code does not need to deal with the complexities of adding more elements, moving the cell calculation, and so on. 3. The methods Calculate() and GetCellState() seem to do the same thing. So, is there a need to have separate methods Answer the question, and then make any necessary changes to the source code based on your answer.

// result will represent the number of changed rows int result = -1; try { // execute the stored procedure 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); } // Update an existing product public static bool UpdateProduct(string productId, string name, string description, string price, string Thumbnail, string Image, string PromoDept, string PromoFront) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogUpdateProduct"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@ProductID"; param.Value = productId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductName"; param.Value = name; param.DbType = DbType.String; param.Size = 50; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductDescription"; param.Value = description; param.DbType = DbType.String; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@Price"; param.Value = price;

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