Adding Record Using AutoCompleteBox in LightSwitch 2012

Here we will see how to add a non-existent record using an AutoCompleteBox in LightSwitch Application (Visual C#) in Visual Studio 2012.

The following is the procedure for adding a non-existent record using an AutoCompleteBox.

Step 1

Open the Solution Explorer.

sol exp.jpg

Step 2

In the Solution Explorer, right-click on the Server and choose "Add Table".

add table.jpg

Step 3

In this way we will add two tables (one is a Student table and another one is College table). The table appears.

Student Table:

stu table.jpg

College Table:


Step 4

Go to the menu bar, click the "Add Relationship" button.


The "Add New Relationship" dialog box appears on the screen. In that, establish a many to zero or one relationship between the two tables.

rel dialog.jpg

Step 5

In the Solution Explorer, right-click on the Screens and choose "Add Screen".

add src.jpg

Step 6

The Add New Screen dialog box appears. Select the "Editable Grid Screen" from the Screen Template, under screen information, choose "Colleges" under the screen data and provide a name to the Screen and click the "OK" button.

editable data grid.jpg

Step 7

Once again add a "New Data Screen" and
from the Screen Template, under screen information, choose "Student" under screen data and provide a name for the Screen and click the "OK" button.

new data src.jpg

Step 8

Add "System.Windows.Controls.Input" to the client project by switching to "File View" in Solution Explorer.

file view.jpg

Step 9

In the Solution Explorer, right-click on the Client folder and choose "Add Reference".


Select "System.Windows.Controls.Input" from the "Reference Manager-Client" dialog box and click "OK".

reference manager.jpg

Step 10

Click on "Write Code" and choose the "_created" method.

write code.jpg

Add the following code:

using System;

using System.Linq;

using System.IO;

using System.IO.IsolatedStorage;

using System.Collections.Generic;

using Microsoft.LightSwitch;

using Microsoft.LightSwitch.Framework.Client;

using Microsoft.LightSwitch.Presentation;

using Microsoft.LightSwitch.Presentation.Extensions;


namespace LightSwitchApplication


    public partial class CreateNewStudent


        partial void CreateNewStudent_InitializeDataWorkspace(global::System.Collections.Generic.List<global::Microsoft.LightSwitch.IDataService> saveChangesTo)


            // Write your code here.

            this.StudentProperty = new Student();



        partial void CreateNewStudent_Saved()


            // Write your code here.





        partial void CreateNewStudent_Activated()


            IContentItemProxy comboControl = this.FindControl("College");

            comboControl.SetBinding(System.Windows.Controls.ComboBox.ItemsSourceProperty, "Screen.Colleges", System.Windows.Data.BindingMode.TwoWay);

            comboControl.SetBinding(System.Windows.Controls.ComboBox.SelectedItemProperty, "Screen.StudentProperty.College", System.Windows.Data.BindingMode.TwoWay);




        partial void CreateNewStudent_Created()


            // Write your code here.

            this.FindControl("College").ControlAvailable += CollegeFieldAvailable;




        private void CollegeFieldAvailable(object sender, ControlAvailableEventArgs e)



            ((System.Windows.Controls.Control)e.Control).LostFocus += CollegeFieldChanged;



        private void CollegeFieldChanged(object sender, System.Windows.RoutedEventArgs e)



            string txtComboText = ((System.Windows.Controls.AutoCompleteBox)sender).Text;

            this.Details.Dispatcher.BeginInvoke(() =>


                if (!string.IsNullOrEmpty(txtComboText))


                    College selectedCollege = this.DataWorkspace.ApplicationData.Colleges.Where(College => College.Name == txtComboText).FirstOrDefault();

                    if (selectedCollege == null)


                        //Category doesn't exists

                        if (this.ShowMessageBox("Do you want to add the college " + txtComboText + "?", "Add College", MessageBoxOption.YesNo) == System.Windows.MessageBoxResult.Yes)


                            selectedCollege = this.DataWorkspace.ApplicationData.Colleges.AddNew();

                            selectedCollege.Name = txtComboText;

                            this.StudentProperty.College = selectedCollege;








Step 11

Press F5 to run the application and choose create new screen. We get:


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