Use of unassigned local variable "strb" StringBuilder

Question

So I am trying to learn how to use the StringBuilder Class. I read up about it and it seems amazing compared to string !

I am trying to create the StringBuilder in the other button but it keeps throwing me the error:

; expected" and Use of unassigned local variable "strb"

on line 42 & 43.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication15
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)    
        {
            string nrmlString = "C#";
            nrmlString += " This";
            nrmlString += " is";
            nrmlString += " a";
            nrmlString += " Test";
            nrmlString += " Thisss";

            MessageBox.Show(nrmlString);                    
        }

        private void button2_Click(object sender, EventArgs e)
        {
            StringBuilder strb new StringBuilder("something");
            strb.Append("Something else");    
            MessageBox.Show(strb.ToString());
        }
    }
}

Answer 1

@VargaDev, Your error was a simple missing of the = in your code.

StringBuilder strb = new StringBuilder("something");

And it has already been answered. I just chimed in for a suggestion. When trying this type of codes, using VS and creating a form is cumbersome. Have a check at the wonderful (and free) utility LinqPad. You can use that as a code scratch pad. ie: For testing your code above, you would simply do this:

-Choose C# statements (or C# program) from the combo -Type

StringBuilder strb = new StringBuilder("something");
strb.Append("Something else");
strb.ToString().Dump();

and hit F5. That is it! Dump() is on streoids. You can dump almost anything, it shows the result in a suitable way (a datagrid for example if it is a list like thing).

PS: I don't have any affiliation with the author of the utility (Joseph Albahari), just a lover of it. It is (and he is) worth to be appraised.