Disable validation for a button in IDataErrorInfo - wpf

Question

I have two buttons "Search" and "Clear" on my View for which I have two commands on my view model. I have implemented IDataErrorInfo on my ViewModel and validated the input fields. How can I disable validation for the Clear button?
<TextBox Text="{Binding SearchText, Mode=TwoWay, ValidatesOnDataErrors=True, NotifyOnValidationError=True, ValidatesOnExceptions=True}"
Validation.ErrorTemplate="{StaticResource ErrorTemplate}"/>
<Button Content="Search" Command="{Binding SearchCommand}" />
<Button Content="Clear" Command="{Binding ClearCommand}" />

Answer 1

I am assumed you want to enable / disable the clear button based on validation in the search textbox. I have used the MvvmLight Relaycommand for commanding from the latest MVVMLight using the namespace using GalaSoft.MvvmLight.CommandWpf; refer the code below.
<Window x:Class="DataTemplateSelector_Learning.Window3"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window3" Height="300" Width="300">
<Grid>
<StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock Text="Search Text"/>
<TextBox Width="100" Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged,Mode=TwoWay,
ValidatesOnDataErrors=True, NotifyOnValidationError=True, ValidatesOnExceptions=True}" />
</StackPanel>
<Button Content="Search" Command="{Binding SearchCommand}" />
<Button Content="Clear" Command="{Binding ClearCommand}" />
</StackPanel>
</Grid>
public partial class Window3 : Window
{
public Window3()
{
InitializeComponent();
this.DataContext = new ViewModel();
}
}
class ViewModel:INotifyPropertyChanged,IDataErrorInfo
{
private string searchText;
private bool enableClear;
public string SearchText
{
get { return searchText; }
set { searchText = value; Notify("SearchText"); }
}
public ICommand SearchCommand { get; set; }
public ICommand ClearCommand { get; set; }
public ViewModel()
{
ClearCommand = new RelayCommand(OnClear, CanClear);
}
private bool CanClear()
{
return enableClear;
}
private void OnClear()
{
}
public event PropertyChangedEventHandler PropertyChanged;
private void Notify(string propName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
public string Error
{
get { return String.Empty; }
}
public string this[string columnName]
{
get
{
String errorMessage = String.Empty;
if (!string.IsNullOrEmpty(SearchText))
{
if (SearchText.Length > 0)
{
enableClear = true;
}
else
{
enableClear = false;
}
}
return errorMessage;
}
}
}