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using System;

using System.Windows.Forms;

namespace UserInfoFormApp

$\{$

$$ public partial class MainForm : Form

$$

$\{$

$$ public MainForm

$($

$)$

$$

$\{$

$$ InitializeComponent

$($

$)$

;

$$ InitializeGenderRadioButtons

$($

$)$

;

$$

$\}$

$$ private void InitializeGenderRadioButtons

$($

$)$

$$

$\{$

$$

$/$

$/$

$$Gender radio buttons

$$ radioButtonMale.Text

$=$

$"$Male$"$;

$$ radioButtonFemale.Text

$=$

$"$Female$"$;

$$ radioButtonOther.Text

$=$

$"$Other$"$;

$$

$\}$

$$ private void buttonSubmit

$\_$

Click

$($

object sender

$,$

$$EventArgs e

$)$

$$

$\{$

$$

$/$

$/$

$$Get user input

$$ string name

$=$

$$textBoxName$.$Text.Trim

$($

$)$

;

$$ string surname

$=$

$$textBoxSurname$.$Text.Trim

$($

$)$

;

$$ int age;

$$ if

$($

$!$

int.TryParse

$($

textBoxAge

$.$

Text, out age

$)$

$)$

$$

$\{$

$$ MessageBox.Show

$($

$"$

Please enter a valid age.", "Error", MessageBoxButtons.OK

$,$

$$MessageBoxIcon$.$Error

$)$

;

$$ return;

$$

$\}$

$$ string gender

$=$

$$GetSelectedGender

$($

$)$

;

$$ string city

$=$

$$textBoxCity$.$Text.Trim

$($

$)$

;

$$

$/$

$/$

$$Validate input

$$ if

$($

string

$.$

IsNullOrEmpty

$($

name

$)$

$|$

$|$

$$string$.$IsNullOrEmpty

$($

surname

$)$

$|$

$|$

$$string$.$IsNullOrEmpty

$($

gender

$)$

$|$

$|$

$$string$.$IsNullOrEmpty

$($

city

$)$

$)$

$$

$\{$

$$ MessageBox.Show

$($

$"$

Please fill in all fields.", "Error", MessageBoxButtons.OK

$,$

$$MessageBoxIcon$.$Error

$)$

;

$$ return;

$$

$\}$

$$

$/$

$/$

$$Display welcome message

$$ string welcomeMessage

$=$

$$$"Welcome,

$\{$

name

$\}$

$\{$

surname

$\}$

$!$

Age:

$\{$

age

$\}$

Gender:

$\{$

gender

$\}$

City:

$\{$

city

$\}$

$"$

;

$$ MessageBox.Show

$($

welcomeMessage

$,$

$"$Welcome$",$ MessageBoxButtons.OK

$,$

$$MessageBoxIcon$.$Information

$)$

;

$$

$/$

$/$

$$Clear the form after submission

$$ ClearForm

$($

$)$

;

$$

$\}$

$$ private string GetSelectedGender

$($

$)$

$$

$\{$

$$ if

$($

radioButtonMale

$.$

Checked

$)$

$$ return "Male";

$$ else if

$($

radioButtonFemale

$.$

Checked

$)$

$$ return "Female";

$$ else if

$($

radioButtonOther

$.$

Checked

$)$

$$ return "Other";

$$ else

$$ return string.Empty;

$$

$\}$

$$ private void ClearForm

$($

$)$

$$

$\{$

$$ textBoxName.Clear

$($

$)$

;

$$ textBoxSurname.Clear

$($

$)$

;

$$ textBoxAge.Clear

$($

$)$

;

$$ radioButtonMale.Checked

$=$

$$false;

$$ radioButtonFemale.Checked

$=$

$$false;

$$ radioButtonOther.Checked

$=$

$$false;

$$ textBoxCity.Clear

$($

$)$

;

$$

$\}$

$$

$\}$

$\}$