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)
  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.


"This is Test".Insert(8,"Insert ") returns "This is Insert Test"
Full Source C#
using System; using System.Windows.Forms; namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { string str = "This is CSharp Test"; string insStr = "Insert "; string strRes = str.Insert(15, insStr); MessageBox.Show(strRes); } } }

When you execute this C# program you will get the message box showing "This is CSharp Insert Test"