Clear a StringBuilder in C#

To clear a StringBuilder, use the Clear() method.

Let’s say we have set the following StringBuilder −

string[] myStr = { "One", "Two", "Three", "Four" };
StringBuilder str = new StringBuilder("We will print now...").AppendLine();

Now, use the Clear() method to clear the StringBuilder −

str.Clear();

Let us see the complete code −

Example

using System;
using System.Text;

public class Demo {
   public static void Main() {
      // string array
      string[] myStr = { "One", "Two", "Three", "Four" };
      StringBuilder str = new StringBuilder("We will print now...").AppendLine();

      // foreach loop to append elements
      foreach (string item in myStr) {
         str.Append(item).AppendLine();
      }
      Console.WriteLine(str.ToString());
      int len = str.Length;
      Console.WriteLine("Length: "+len);

      // clearing
      str.Clear();
      int len2 = str.Length;
      Console.WriteLine("Length after using Clear: "+len2);
      Console.ReadLine();
   }
}

Output

We will print now...
One
Two
Three
Four

Length: 40
Length after using Clear: 0