How to remove all characters from StringBuilder in C#

StringBuilder.Clear Method is used to remove all the characters from the current StringBuilder instance.

Syntax:

public System.Text.StringBuilder Clear ();

It returns an StringBuilder object whose length will be zero.

Note:

• Clear is a convenience method that is equivalent to setting the Length property of the current instance to 0 (zero).
• Calling the Clear method does not modify the current instance’s Capacity or MaxCapacity property.

Example:

// C# program to demonstrate
// the Clear() Method
using System;
using System.Text;

class GFG {

    // Main Method
    public static void Main(String[] args)
    {
        // Creating a StringBuilder object
        StringBuilder sb1 = new StringBuilder("GeeksforGeeks");

        // printing the length of "GeeksforGeeks"
        Console.WriteLine("The String is: {0} \nTotal characters -- {1}",
                                             sb1.ToString(), sb1.Length);

        // using the method
        sb1.Clear();

        // printing the length of "GeeksforGeeks"
        Console.WriteLine("The String is: {0} \nTotal characters -- {1}",
                                             sb1.ToString(), sb1.Length);

        sb1.Append("This  is C# Tutorials.");

        // printing the length of "GeeksforGeeks"
        Console.WriteLine("The String is: {0} \nTotal characters -- {1}",
                                             sb1.ToString(), sb1.Length);
    }
}

Output:

The String is: GeeksforGeeks 
Total characters -- 13
The String is:  
Total characters -- 0
The String is: This  is C# Tutorials. 
Total characters -- 22

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.text.stringbuilder.clear?view=netframework-4.7.2