Your xaml
<TextBlock Text="123" Name="MyTextBlock" />Your code that wants to alter it
string ControlName = "MyTextBlock";
var TextBlock1 = this.FindName(ControlName) as TextBlock;
TextBlock1.Text = "abc";Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.