insert line number in to richtextbox in c#

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  • #4123

    if you want to insert line numbers into richtextbox control. Suppose you have a richtextbox control with the some text of lines and you want to add line number as prefix (1,2,3…), you can use the following code of lines:

    string[] arrStr = richTextBox1.Lines;
    for (int i = 0; i < arrStr.Length ; i++)
       arrStr[i] = i+1 + ". " + arrStr[i];
    richTextBox1.Lines = arrStr;

    Line numbers in Rich text box

    Try the code..

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