c# - RichTextBox not typeable in between -

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i color text in richtextbox after cannot type in between text, using code, problem ? in string below 2,3,4,9,22,92 not able write in between writes after string.

richtextbox1.text = "2,3,4,9,22,92"; richtextbox1.selectionstart = 0; richtextbox1.selectionlength = richtextbox1.text.length; richtextbox1.selectioncolor = color.green;


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