GroupBox

GroupBox — отображает рамку вокруг группы элементов управления и, необязательно, заголовок над ней.

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Form1.cs

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 WindowsFormsApplication1 {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
groupBox1.Select();
}
private void radioButton1_CheckedChanged(object sender, EventArgs e) {
textBox1.BackColor = Color.FromArgb(255, 0, 0);
}
private void radioButton2_CheckedChanged(object sender, EventArgs e) {
textBox1.BackColor = Color.FromArgb(0, 255, 0);
}
private void radioButton3_CheckedChanged(object sender, EventArgs e) {
textBox1.BackColor = Color.FromArgb(0, 0, 255);
}
}
}

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 WindowsFormsApplication1 {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
groupBox1.Select();
}
private void radioButton1_CheckedChanged(object sender, EventArgs e) {
textBox1.BackColor = Color.FromArgb(255, 0, 0);
}
private void radioButton2_CheckedChanged(object sender, EventArgs e) {
textBox1.BackColor = Color.FromArgb(0, 255, 0);
}
private void radioButton3_CheckedChanged(object sender, EventArgs e) {
textBox1.BackColor = Color.FromArgb(0, 0, 255);
}
}
}