WPF, ComboBox, Tooltip or text, return value should be int or enum

Question

Hello,
<ComboBox Name="cbStatus" HorizontalAlignment="Left" Margin="660,13,0,0" VerticalAlignment="Top" Width="48" SelectionChanged="CbStatus_SelectionChanged">
<ComboBoxItem>20</ComboBoxItem>
<ComboBoxItem>21</ComboBoxItem>
<ComboBoxItem>22</ComboBoxItem>
<ComboBoxItem>23</ComboBoxItem>
<ComboBoxItem IsSelected="True">24</ComboBoxItem>
</ComboBox>
How can I insert a tooltip?

How can I display the text, but the selected value is a number?

string cb_State = ((ComboBoxItem)cbStatus.SelectedItem).Content.ToString();

Only for this control.
20 = "Automatic"
21 = "Error"
22 = "Wait"
23 = "Blocked"
24 = "Rmove"

Answer 1

I will give you a sample which use MVVM to bind the data for ComboBox.

public class Model  
    {  
        private string cmbValue;  
        public string CmbValue  
        {  
            get { return cmbValue; }  
            set { cmbValue = value; }  
        }  
        private string cmbText;  
        public string CmbText  
        {  
            get { return cmbText; }  
            set { cmbText = value;  }  
        }      
    }  

The View model is:

The MainWindow.xaml is :

<ComboBox Name="cbStatus"  
                  ItemsSource="{Binding Comlist}"   
                  SelectedValuePath="CmbValue"       
                  DisplayMemberPath="CmbText"     
                  Width="100" Height="30"  
                  SelectedItem="{Binding Comlist[4]}"  
                  SelectionChanged="cbStatus_SelectionChanged"  
                  />  

Then you can get the value or text by:

 private void cbStatus_SelectionChanged(object sender, SelectionChangedEventArgs e)  
        {  
            string cb_StateValue = ((Model)cbStatus.SelectedItem).CmbValue;  
            string cb_StateText = ((Model)cbStatus.SelectedItem).CmbText;  
        }  

Answer 2

Hi Peter,
MVVM - You know I use the ViewModel in my main project.
I make some test project and in this case, easier is the solution from @DaisyTian-MSFT

Your solution is for MVVM, right?
Solution from @DaisyTian-MSFT is 'normal' as WinForms.

So how I can fill this <ComboBoxItem Tag="23" ToolTip="Blocked">Blocked</ComboBoxItem> by code?
In case of the list is large or read from a text file or xml file.

MVVM is with binding the controls, right and also code behind, so not possible with the solution from @DaisyTian-MSFT
You call CodeBehind, when I use no binding for controls, right?

Answer 3

Thanks, both of you. I can only accept one answer.

Both are helpful.