Download the Solution Example here:
- Solution file: ComboBoxFromTable.dbsln
- Database file: ComboBoxFromTable.db
- Solution Name: Combo Box From Table
- Software Version:
- v10
- Keywords: ComboBox, Datasets
Summary
This solution demonstrates how to populate ComboBoxes using a data table.
Technical Information
First, you need to obtain control of the ComboBox on the display. This is achieved through the following lines:
| Code Block |
|---|
ComboBox cbxListCodes;
public void DisplayOpening()
{
cbxListCodes = CurrentDisplay.GetControl("cbxListCodes") as ComboBox;
}
|
After that, you need to load your data table. In this example, we will retrieve the entire table asynchronously.
| Code Block |
|---|
// Selects the whole table @Dataset.Table.Products.WhereCondition = ""; DataTable dt = await @Dataset.Table.Products.SelectCommandAsync(); |
Next, you can use a simple foreach loop to select which rows to add to the ComboBox, as shown in the code snippet below.
| Code Block |
|---|
// Inserts each row to the combobox
foreach (DataRow row in dt.Rows)
{
cbxListCodes.Items.Add(row["ListCode"]);
}
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Finally, using an EventHandler, you can determine the value selected by the client from the ComboBox and update the other TextBoxes accordingly.
| Code Block |
|---|
cbxListCodes.SelectionChanged += new SelectionChangedEventHandler(codeChanged);
public void codeChanged(object sender, SelectionChangedEventArgs args)
{
if(cbxListCodes.SelectedValue == null)
return;
//Selecting from the DB only the Item corresponding to the Code Selected in the ComboBox
@Dataset.Table.Products.WhereCondition = "ListCode = " + cbxListCodes.SelectedValue.ToString();
@Dataset.Table.Products.SelectCommandAsync();
} |
Reference Information
→ See Displays (Desktop and Web) for more information.
→ See ComboBox Control for more information.
→ See Datasets Tables for more information.
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