So currently I now have only one error:

using System;

using System.Collections.Generic;

using System.Windows.Forms;

namespace ProjectedRaisesGUI

$\{$

public partial class Form$1$ : Form

$\{$

private readonly Label lblCurrentSalary;

private readonly TextBox txtCurrentSalary;

private readonly Button btnCalculate;

private readonly Label lblResult;

public Form$1()$

$\{$

InitializeComponent$()$;

lblCurrentSalary $=$ new Label$()$;

txtCurrentSalary $=$ new TextBox$()$;

btnCalculate $=$ new Button$()$;

lblResult $=$ new Label$()$;

lblCurrentSalary.Text $=$ "Current Salary:";

lblCurrentSalary.Location $=$ new System.Drawing.Point$(10,20)$;

lblCurrentSalary.AutoSize $=$ true;

txtCurrentSalary.Location $=$ new System.Drawing.Point$(150,20)$;

txtCurrentSalary.Width $=100$;

btnCalculate.Text $=$ "Calculate";

btnCalculate.Location $=$ new System.Drawing.Point$(10,60)$;

btnCalculate.Click $+=$ new EventHandler$($BtnCalculate$\_$Click$)$;

lblResult.Location $=$ new System.Drawing.Point$(10,100)$;

lblResult.AutoSize $=$ true;

this.Controls.Add$($lblCurrentSalary$)$;

this.Controls.Add$($txtCurrentSalary$)$;

this.Controls.Add$($btnCalculate$)$;

this.Controls.Add$($lblResult$)$;

this.Text $=$ "Projected Salary Calculator";

this.StartPosition $=$ FormStartPosition.CenterScreen;

this.Size $=$ new System.Drawing.Size$(300,200)$;

$\}$

private void BtnCalculate$\_$Click$($object sender$,$ EventArgs e$)$

$\{$

try

$\{$

double currentSalary $=$ Convert.ToDouble$($txtCurrentSalary$.$Text$)$;

double increaseRate $=0\mathrm{.}04$; $//4\%$ increase rate

double projectedSalary $=$ currentSalary $*(1+$ increaseRate$)$;

lblResult.Text $=$ $"New Salary: $$\{$projectedSalary:F$2\}"$;

$\}$

catch $($FormatException$)$

$\{$

MessageBox.Show$("$Please enter a valid number for the salary.", "Input Error", MessageBoxButtons.OK$,$ MessageBoxIcon.Error$)$;

$\}$

$\}$

$[$STAThread$]$

private static void Main$()$

$\{$

Application.EnableVisualStyles$()$;

Application.SetCompatibleTextRenderingDefault$($false$)$;

Application.Run$($new Form$1())$;

$\}$

public override bool Equals$($object obj$)$

$\{$

return obj is Form$1$ form &&

EqualityComparer.Default.Equals$($lblResult$,$ form.lblResult$)$;

$\}$

$\}$

$\}$

Code above:

Severity Code Description Project File Line Suppression State

Error $($active$)$ CS$0017$ Program has more than one entry point defined. Compile with $/$main to specify the type that contains the entry point.

And I can't figure out why. This is for the button specifically so I can get it to work, but it won't. Please help