How do i change the image path at run time in wpf ?

Question

I have a button and i need to show image two different image based on condition. 
<Button x:Name="btn" MouseEnter="btn_MouseEnter_1">
<Button.Template>
<ControlTemplate TargetType="Button">
<StackPanel Width="43">
<Image Name="btnS" Source="Resources/main.png" />
</StackPanel>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True" />
<Condition Property="IsEnabled" Value="True" />
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter TargetName="btnS" Property="Source" Value="Resources/hover.png"></Setter>
</MultiTrigger.Setters>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsPressed" Value="True" />
<Condition Property="IsEnabled" Value="True" />
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter TargetName="btnS" Property="Source" Value="Resources/audio-push.png" />
</MultiTrigger.Setters>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="btnS" Property="Source" Value="/Resources/disabled.png" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
</Button>
I want to change the source of btnS at run time bases on condition.
Suppose that if a = 1 then 
btnS source is "Resources/main.png" this
else btnS source should be "Resources/main1.png"
same for mouse hover and enable disable triggers.
Thanks,

Answer 1

Hi Sumit,
We can use
VisualTreeHelper class to find Image control in visual tree.
UIHelper.cs:
public class UIHelper
public static T FindChild<T>(DependencyObject parent, string childName)
where T : DependencyObject
// Confirm parent and childName are valid.
if (parent == null) return null;
T foundChild = null;
int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < childrenCount; i++)
var child = VisualTreeHelper.GetChild(parent, i);
// If the child is not of the request child type child
T childType = child as T;
if (childType == null)
// recursively drill down the tree
foundChild = FindChild<T>(child, childName);
// If the child is found, break so we do not overwrite the found child.
if (foundChild != null) break;
else if (!string.IsNullOrEmpty(childName))
var frameworkElement = child as FrameworkElement;
// If the child's name is set for search
if (frameworkElement != null && frameworkElement.Name == childName)
// if the child's name is of the request name
foundChild = (T)child;
break;
else
// child element found.
foundChild = (T)child;
break;
return foundChild;
Code Behind:
private void Button_Click(object sender, RoutedEventArgs e)
Image image1 = UIHelper.FindChild<Image>(btn, "btnS");
if(image1!=null)
image1.Source = new BitmapImage(
new Uri("Resources/main1.png", UriKind.Relative)
Screenshot:
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