How to implement seach text functionality by using WPF in C# (examaple how we do find in the browser window)

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C#

WPF

We want to implement find text using WPF in c# , We tried with the indexing of the content but we are unable to find the content.

FileInfo is the richtextbox.

Kindly help us on this...

What I have tried:

int index = 0;
TextRange txt=new TextRange(
FileInfo.Document.ContentStart,
FileInfo.Document.ContentEnd
);
string temp = txt.Text;
FileInfo.Visibility = Visibility.Visible;
while (index < temp.LastIndexOf(FindOp.Text))
{
FileInfo.FindName(FindOp.Text);
FileInfo.Foreground = Brushes.Red;
index = temp.IndexOf(FindOp.Text, index) + 1;
}