Introduction We have already seen how to validate input data using DataAnnotations and DataInput controls. In this article we will see how it can be implemented to a DataGrid. That means validating user input in DataGrid. Creating Silverlight Project
Fire up Visual Studio 2008 and create a Silverlight Application. Name it as DataValidationDataGridSL3. 
Now we need a DataGrid to display sample data.Go ahead and add it and name it as MyDataGrid. 
Now we need to add a class which contains the properties of the sample data.
{codecitation class="brush: csharp; gutter: true;" width="650px"}
public class Users
{
public string Name { get; set; }
public int Age { get; set; }
public string Gender { get; set; }
public string Country { get; set; }
}
{/codecitation}
DataAnnotation provides a developer friendly DataValidation techniques. So we need to add the assembly. System.ComponenentModel.DataAnnotations. The ValidationException (belonging to System.ComponentModel.DataAnnotations ) thrown is displayed as Cell Validation Error
Now that you have added the above assembly, use it in the Users.cs class and define the properties as required. As follows:
{codecitation class="brush: csharp; gutter: true;" width="650px"}
public class Users: INotifyPropertyChanged
{
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region UserName
private string _UserName;
public string UserName
{
get { return _UserName; }
set
{
if (value.Length < 4)
{
throw new ValidationException("User Name should contain atleast 4 chars");
}
_UserName = value;
RaisePropertyChanged("UserName");
}
}
#endregion
#region Age
private int _Age;
public int Age
{
get { return _Age; }
set
{
_Age = value;
}
}
#endregion
#region Gender
private string _Gender;
public string Gender
{
get { return _Gender; }
set
{
_Gender = value;
}
}
#endregion
#region Country
private string _Country;
public string Country
{
get { return _Country; }
set
{
_Country = value;
}
}
#endregion
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
{/codecitation}
Now add some sample data in the MainPage constructor and bind the DataGrid’s ItemSource to the sample data.
{codecitation class="brush: csharp; gutter: true;" width="650px"}
public MainPage()
{
InitializeComponent();
List<Users> myList = new List<Users>
{
new Users{ UserName="Hiro Nakamura", Age=24, Gender="M", Country="Japan"},
new Users{ UserName="Mohinder Suresh", Age=26, Gender="M", Country="India"},
new Users{ UserName="Claire Bennette", Age=20, Gender="F", Country="USA"},
new Users{ UserName="Matt Parkman", Age=30, Gender="M", Country="USA"},
new Users{ UserName="Nathan Patrelli", Age=30, Gender="M", Country="USA"},
new Users{ UserName="Peter Patrelli", Age=26, Gender="M", Country="USA"},
new Users{ UserName="Mica Sanders", Age=19, Gender="M", Country="USA"},
new Users{ UserName="Linderman", Age=56, Gender="M", Country="USA"},
new Users{ UserName="Ando", Age=24, Gender="M", Country="Japan"},
new Users{ UserName="Maya", Age=24, Gender="F", Country="Mexico"},
new Users{ UserName="Angela Patrelli", Age=26, Gender="F", Country="USA"},
new Users{ UserName="Niki Sanders", Age=26, Gender="F", Country="USA"},
};
MyDataGrid.ItemsSource = myList;
}
{/codecitation}
That’s it run your application and try to change the first name and keep it empty or enter less than 4 characters. It will throw you a ValidationException. As follows: 
Try for other columns as required.Enjoy Coding.
| About the Author |
 | | Diptimaya Patra |
Description :I am a Master in Computer Application (MCA) from SRM University, Chennai. I am MCTS in ASP.Net Web Development, and MOSS 2007 Administration. I have extreme exposure to Microsoft Technologies in recent times like Silverlight 2, Silverlight 3. I am from Cuttack, Orissa. You can reach me using this mail (diptimaya.patra@gmail.com). Currently I am working as a Software Engineer in UST Global Inc in Trivandrum Center.
Occupation :Software Engineer
Company : UST Global.
Location : India
Follow me at twitter : http://twitter.com/dpatra
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