Hello Everyone,

I am trying to restrict user to select duplicate values in a column from xamdatagrid.

Can anyone explain me how to achieve the above requirement.

Data grid cell style is combobox so user can select items from combobox. 

Below is my Model

Employee.cs

public class Employee
{
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
}
}

private string _department;
public string Department
{
get
{
return _department;
}
set
{
_department = value;
}
}

public Employee(string name, string dep)
{
this.Name = name;
this.Department = dep;
}
}

ViewModel.CS

public class ViewModel : INotifyPropertyChanged
{
private ObservableCollection _coll1;

public ObservableCollection Coll1
{
get
{
return _coll1;
}
set
{
_coll1 = value;
NotifyPropertyChanged("Coll1");
}
}

private ObservableCollection _coll2;

public ObservableCollection Coll2
{
get
{
return _coll2;
}
set
{
_coll2 = value;
NotifyPropertyChanged("Coll2");
}
}

private List _employeeColl;

public List EmployeeColl
{
get
{
return _employeeColl;
}
set
{
_employeeColl = value;
NotifyPropertyChanged("EmployeeColl");
}
}

public ViewModel()
{
Coll1 = new ObservableCollection () { "AAA", "AASSSA", "AAAAXX"};
Coll2 = new ObservableCollection () { "XX", "DD", "DDD" };

EmployeeColl = new List() { new Employee("Emp1", "Dep1"), new Employee("Emp2", "Dep2") };
}

public event PropertyChangedEventHandler PropertyChanged;

private void NotifyPropertyChanged(string propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}

Xaml

<Grid>
<igDP:XamDataGrid DataSource="{Binding Path=EmployeeColl, UpdateSourceTrigger=PropertyChanged}">
<igDP:XamDataGrid.FieldSettings>
<igDP:FieldSettings/>
</igDP:XamDataGrid.FieldSettings>

<igDP:XamDataGrid.FieldLayoutSettings>
<igDP:FieldLayoutSettings AddNewRecordLocation="OnTopFixed" AllowAddNew="True" AllowDelete="True" SupportDataErrorInfo="RecordsAndCells" DataErrorDisplayMode="ErrorIconAndHighlight"/>
</igDP:XamDataGrid.FieldLayoutSettings>

<igDP:XamDataGrid.FieldLayouts>
<igDP:FieldLayout>
<igDP:ComboBoxField Name="Name" Width="*">
<igDP:ComboBoxField.EditorStyle>
<Style TargetType="igEditors:XamComboEditor">
<Setter Property="ItemsSource"
Value="{Binding Path=DataContext.Coll1, RelativeSource={RelativeSource AncestorType={x:Type igDP:XamDataGrid}}}" />
</Style>
</igDP:ComboBoxField.EditorStyle>
</igDP:ComboBoxField>
<igDP:ComboBoxField Name="Department" Width="*">
<igDP:ComboBoxField.EditorStyle>
<Style TargetType="igEditors:XamComboEditor">
<Setter Property="ItemsSource"
Value="{Binding Path=DataContext.Coll2, RelativeSource={RelativeSource AncestorType={x:Type igDP:XamDataGrid}}}" />
</Style>
</igDP:ComboBoxField.EditorStyle>
</igDP:ComboBoxField>
</igDP:FieldLayout>
</igDP:XamDataGrid.FieldLayouts>
</igDP:XamDataGrid>

</Grid>