How to use C# string Insert

The Insert() function in String Class will insert a String in a specified index in the String instance.


  1. ind - The index of the specified string to be inserted.
  2. str - The string to be inserted.


  1. String - The result string.


  1. System.ArgumentOutOfRangeException: startIndex is negative or greater than the length of this instance.
  2. System.ArgumentNullException : If the argument is null.


using System;
using System.Windows.Forms;

namespace WindowsApplication1
    public partial class Form1 : Form
        public Form1()

        private void button1_Click(object sender, EventArgs e)
            string str = "This is CSharp Test";
            string insStr = "Insert ";
            string strRes = str.Insert(15, insStr);

When you execute this C# program you will get the message box showing "This is CSharp Insert Test" (C) 2021    Founded by raps mk
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