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The methods that modify data (the event handlers for the Update and Delete buttons) need to read information from the data grid and the ID of the item on which the action happens Because delete and update operations are based on departments IDs, you need to obtain somehow the ID of the department to be updated or deleted The problem is that you can t extract DepartmentID from the visible part of the GridView, because we chose not to display it for the user (it s a low-level detail, useless for the user) So, how do you know the ID associated with a GridView row Fortunately, the designers of the GridView control anticipated this problem and added a DataKeyNames property to the GridView, which can hold one or more keys for each row in the grid.

When creating the grid, you set its DataKeyNames property to DepartmentID, causing the grid to retain the ID of each loaded department The code in grid_RowUpdating demonstrates how to get the ID of the row that is about to updated: // Update row protected void grid_RowUpdating(object sender, GridViewUpdateEventArgs e) { // Retrieve updated data string id = gridDataKeys[eRowIndex]ValueToString(); The rest of the code shows how to retrieve data from the rows of the GridView Each row in the grid is a collection of cells, and each cell is a collection of controls Given that you know which control you are looking for, it becomes a fairly easy job to get the name or description of a department You read the first cell of the row to obtain the name and the second cell to obtain the description.

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If you are used to developing for other databases, you are also probably used to having tools to inspect and manipulate the contents of the database, beyond merely the database s API. With Android s emulator, you have two main options for this. First, the emulator is supposed to bundle in the sqlite3 console program and make it available from the adb shell command. Once you are in the emulator s shell, just execute sqlite3, providing it the path to your database file. Your database file can be found at the following location:

Subjects and concepts covered in 3:

In both cases, you read the first control, which you convert to a TextBox to be able to read the Text property // Retrieve updated data string id = gridDataKeys[eRowIndex]ValueToString(); string name = ((TextBox)gridRows[eRowIndex]Cells[0]Controls[0])Text; string description = ((TextBox)gridRows[eRowIndex]Cells[1] Controls[0])Text; To make this functionality even clearer, take a look at the following code block, which reads the department s name from the grid, but in a step-by-step fashion:.

Here, your.app.package is the Java package for your application (e.g., com.commonsware.android), and your-db-name is the name of your database, as supplied to createDatabase(). The sqlite3 program works, and if you are used to poking around your tables using a console interface, you are welcome to use it. If you prefer something a little friendlier, you can always copy the SQLite database off the device onto your development machine, and then use a SQLite-aware client program to putter around. Note, though, that you are working off a copy of the database; if you want your changes to go back to the device, you will need to transfer the database back over. To get the database off the device, you can use the adb pull command (or the equivalent in your IDE, or File Manager in the Dalvik Debug Monitor Service, discussed

Arrays and how to use them What a potentiometer (or variable resistor) is and how to use it Reading voltage values from an analog input pin How to use the mathematical sine (sin) function Converting degrees to radians The concept of casting a variable to a different type Pulse Width Modulation (PWM) and how to use it with analogWrite()

protected void grid_RowUpdating(object sender, GridViewUpdateEventArgs e) { // Get the index of the row to be modified int rowIndex = e.RowIndex; // Get a reference to the row being updated GridViewRow gridViewRow = grid.Rows[rowIndex]; // Get the first cell (one which contains the name) TableCell tableCell = gridViewRow.Cells[0]; // Get the first control in the cell Control control = tableCell.Controls[0]; // Access the control through a TextBox reference TextBox textBox = (TextBox)control; // Get the text from the TextBox string name = textBox.Text; After the ID, new name, and new description of the department are known, the business tier is called to apply the changes. The CatalogAccess.UpdateDepartment method returns a Boolean value specifying whether the update was performed successfully, and then the status label is populated based on this value: // Execute the update command bool success = CatalogAccess.UpdateDepartment(id, name, description); // Cancel edit mode grid.EditIndex = -1; // Display status message statusLabel.Text = success "Update successful" : "Update failed"; // Reload the grid BindGrid(); }

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