c# - Change color in part of text in textblock -

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i need change color in code behind part of text string..

my exaple: 

textblock1.text = string1 + string2 + string3;

string have dynamic values, , want string2 display after running program in blue color , must defined in code behind.

its possible? thank you!

that working 

                        textblock1.inlines.clear();                         textblock1.inlines.add(new run(string1));                         textblock1.inlines.add(new run(string2) { foreground = brushes.blue });

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