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Download the Solution Example here: ComboBoxFromTable.dbsln


Software Version: 10.1

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:


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.


// 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.

// Inserts each row to the combobox
foreach (DataRow row in dt.Rows)
{
    cbxListCodes.Items.Add(row["ListCode"]);
}


Finally, using an EventHandler, you can determine the value selected by the client from the ComboBox and update the other TextBoxes accordingly.


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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