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How to use C# string Insert

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

string string.Insert(int ind,string str)


  • ind – The index of the specified string to be inserted.
  • str – The string to be inserted.


  • String – The result string.


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


"This is Test".Insert(8,"Insert ") returns "This is Insert Test"
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”.

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