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HOW RAISE AN EVENT WHENEVER A PROPERTY'S VALUE CHANGED?

Manoj Bhatt 2014 04-Jan-2016
I want to use an event whenever a property's value changed . how to use this in a program please help me.
c# c#  .net 
Updated on 06-Jan-2016
Manoj Bhatt

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3 Answers

Anupam Mishra

Anupam Mishra

06-Jan-2016
For more details you can also read out this one: Click Here
Manoj Bhatt

Manoj Bhatt

05-Jan-2016
thank you sir.
Anupam Mishra

Anupam Mishra

04-Jan-2016

In C#, the INotifyPropertyChanged interface is used notify clients, typically binding clients, that a property value has changed.

For example, consider an Employee class object with a property called FirstName. To provide property-change notification, the Employee class type implements the INotifyPropertyChanged interface and raises a PropertyChanged event when FirstName is changed.

For change notification to occur in a binding between a bound client and a data source, your bound type should either:

·         Implement the INotifyPropertyChanged interface (preferred).

·         Provide a change event for each property of the bound type.

Do not do both.

For example, in below we have defined a property ‘FirstName’

private string _firstName;
       
public string FirstName
       
{
            get
            {
                return _firstName;
            }
            set
            {
                _firstName = value;
                OnPropertyChanged("FirstName");
       
    }
        }


Now, we have implementing the INotifyPropertyChanged interface

 



public event PropertyChangedEventHandler PropertyChanged;
 
       
protected void OnPropertyChanged(string propertyName)
       
{
            OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
       
}
 
 // occurring event       
private void OnPropertyChanged(PropertyChangedEventArgs e)
       
{
                     MessageBox.Show(“Changed in First Name ”+FirstName);
        }

Output:

HOW RAISE AN EVENT WHENEVER A PROPERTY

I think in above example you are understand about raises event when 'FirstName'  property values are changed.

    For more details , you click here

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