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Doing so will launch the Grant/Revoke Privileges window shown in Figure 14-8. You can set the privileges for each user shown in the User drop-down list. You can also preview the DDL statements generated from your settings by clicking the Preview SQL button. When you are finished with your changes, click the Apply or OK button. The privileges you ve configured will automatically be applied on the selected object.

Figure 21-17. A resizable column of buttons To implement this design, follow these steps: 1. Add a TableLayoutPanel for the three buttons. Define the basic structure by setting RowCount to 3 and ColumnCount to 1, and add the three buttons. 2. Edit the RowStyles collection of the TableLayoutPanel (which is exposed in the Properties window as the Rows collection) so that each row has an Absolute size of 30 pixels. This is because the buttons should all have the same height (if you want to allow different fonts and character sets for other languages, this isn t necessarily true). To make sure the last row isn t stretched, make sure the TableLayoutPanel height is equal to three rows heights (in this case, 90 pixels). 3. Edit the ColumnStyles collection of the TableLayoutPanel so that the single column uses AutoSize, which allows the table to grow with the buttons. Also set the initial width of the TableLayoutPanel (such as 100 pixels). 4. Add a button in each cell. 5. Change each button by setting the AutoSize property to true (so the button can grow with its caption text), and set the Dock property to Fill (so that the button expands to fill the full cell). This step implements the basic design. If the content of any button is extended, the button will resize to fit. This action will widen the column, and the other buttons will follow suit because of to their docking properties. 6. Finally, to get everything to display correctly, you need to make sure the TableLayoutPanel and the containing form also expand as the column expands. To achieve this, set the AutoSize property of both to true.

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Under a clustered index organization, all other indexes built against the table are built on top of the clustered index keys These non-primary indexes are called secondary indexes Just as in the index sequential access method, where the record identifier value is paired with the index key value for each index record, the clustered index key is paired with the index key value for the secondary index records The primary advantage of clustered index organization is that the searches on the primary key are remarkably fast, because no lookup operation is required to jump from the index record to the data record For searches on the clustering key, the index record is the data record they are one and the same For this reason, InnoDB tables make excellent choices for tables on which queries are primarily done on a primary key.

The reverse process ensures that the final committed value doesn t use the currency symbol. To connect this logic, you need to begin by creating a Binding object, then register to receive its events, and finally add it to the DataBindings collection of the bound textbox. Notice that the following code adds a trick it registers for the DataTable.ColumnChanged event. This way, you can verify what value is actually inserted into the DataTable. // Create the binding. Binding costBinding = new Binding("Text", dt, "UnitCost"); // Connect the methods for formatting and parsing data. costBinding.Format += new ConvertEventHandler(DecimalToCurrencyString); costBinding.Parse += new ConvertEventHandler(CurrencyStringToDecimal); // Add the binding. txtUnitCost.DataBindings.Add(costBinding); // Register an event handler for changes to the DataTable (optional). dt.ColumnChanged += new DataColumnChangeEventHandler(TableChanged); The event-handling code for formatting simply returns the new converted value by setting the e.Value property. private object previousUnitCost; private void DecimalToCurrencyString(object sender, ConvertEventArgs e) { if (e.DesiredType == typeof(string)) { previousUnitCost = e.Value; // Use the ToString method to format the value as currency ("c"). e.Value = ((decimal)e.Value).ToString("c"); } } private void CurrencyStringToDecimal(object sender, ConvertEventArgs e) { if (e.DesiredType == typeof(decimal)) { // Convert the string back to decimal using the static Parse method. // Use exception handling code in case the text can t be interpreted // as a decimal. try { e.Value = Decimal.Parse(e.Value.ToString()); }

Figure 14-8. Setting privileges for the Products table The following list contains some of the main reasons why you might want to use the ODT.NET roles and privileges feature in your project:

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