missing a braces somewhere

using System;

using static System.Console;

using System.Globalization;

class SalesTransactionDemo

$\{$

static void Main$()$

$\{$

private string name;

private double salesAmount;

private double commission;

public SalesTransactionDemo$($string name, double salesAmount, double rate$)$

$\{$

this.name $=$ name;

this.salesAmount $=$ salesAmount;

this.commission $=$ salesAmount $*$ rate;

$\}$

public SalesTransactionDemo$($string name, double salesAmount$)$

$\{$

this.name $=$ name;

this.salesAmount $=$ salesAmount;

this.commission $=0$;

$\}$

public SalesTransactionDemo$($string name$)$

$\{$

this.name $=$ name;

this.salesAmount $=0$;

this.commission $=0$;

$\}$

public static double GetRate$()$

$\{$

return RATE;

$\}$

$\{$

string name$\_$all $=$ $$"\{$change$\_1.$name$\}$ and $\{$change$\_2.$name$\}"$;

double SalesAmount$\_$all $=$ change$\_1.$salesAmount $+$ change$\_2.$salesAmount;

return new SalesTransactionDemo$($name$\_$all, SalesAmount$\_$all, RATE$)$;

$\}$

public void Display$()$

$\{$

WriteLine$("$Salesperson: $\{0\}",$ name$)$;

WriteLine$("$Sales Amount: $\{0\}",$ salesAmount.ToString$("$C$",$ CultureInfo.GetCultureInfo$("$en$-$US$")))$;

WriteLine$("$Commission: $\{0\}",$ commission.ToString$("$C$",$ CultureInfo.GetCultureInfo$("$en$-$US$")))$;

WriteLine$("$Commission Rate: $\{0\}",$ RATE.ToString$("$P$",$ CultureInfo.InvariantCulture$))$;

WriteLine$()$;

$\}$

$//$ Write your code here

$\}$

$\}$