1. Creating Controls Dynamically in C#

2. Dynamically Generated Controls
the user selects the number of radio buttons to generate and then presses the Build Itt button

3. The Complete Source Code
private void btnBuildIt_Click(object sender, EventArgs e) {
int hsep = 40;
int num = (int)numUDCount.Value;
if (numUDCount.Value > 0)
Form1.ActiveForm.Height = num * hsep;
GroupBox gBox = new GroupBox();
gBox.Text = "Demo Group";
gBox.Size = new Size(200, 20 + num * hsep);
gBox.Location = new Point(20, 20);
this.Controls.Add(gBox);
for (int i = 0; i < num; i++)
rb.Add(new RadioButton());
rb[i].AutoSize = true;
rb[i].Location = new Point(15, 20 + hsep * i);
rb[i].Name = "radioButton" + Convert.ToString(i);
rb[i].Text = "This is Radio Button " + Convert.ToString(i);
gBox.Controls.Add(rb[i]); }
btnBuildIt.Enabled = false;

4. num is the number of Radio Buttons to be created
private void btnBuildIt_Click(object sender, EventArgs e) {
int hsep = 40;
int num = (int)numUDCount.Value;
if (numUDCount.Value > 0)
Form1.ActiveForm.Height = num * hsep;
GroupBox gBox = new GroupBox();
gBox.Text = "Demo Group";
gBox.Size = new Size(200, 20 + num * hsep);
gBox.Location = new Point(20, 20);
this.Controls.Add(gBox);
for (int i = 0; i < num; i++)
rb.Add(new RadioButton());
rb[i].AutoSize = true;
rb[i].Location = new Point(15, 20 + hsep * i);
rb[i].Name = "radioButton" + Convert.ToString(i);
rb[i].Text = "This is Radio Button " + Convert.ToString(i);
gBox.Controls.Add(rb[i]); }
btnBuildIt.Enabled = false;
hsep will be used to set the separation in height between the radio buttons
num is the number of Radio Buttons to be created

5. Form1 is resized to hold the new controls
private void btnBuildIt_Click(object sender, EventArgs e) {
int hsep = 40;
int num = (int)numUDCount.Value;
if (numUDCount.Value > 0)
Form1.ActiveForm.Height = num * hsep;
GroupBox gBox = new GroupBox();
gBox.Text = "Demo Group";
gBox.Size = new Size(200, 20 + num * hsep);
gBox.Location = new Point(20, 20);
this.Controls.Add(gBox);
for (int i = 0; i < num; i++)
rb.Add(new RadioButton());
rb[i].AutoSize = true;
rb[i].Location = new Point(15, 20 + hsep * i);
rb[i].Name = "radioButton" + Convert.ToString(i);
rb[i].Text = "This is Radio Button " + Convert.ToString(i);
gBox.Controls.Add(rb[i]); }
btnBuildIt.Enabled = false;
Form1 is resized to hold the new controls
a GroupBox is created to hold the Radio Buttons
gBox is resized to hold i Radio Buttons
gBox is located on the main Form
gBox is added the to this Form's set of Controls

6. this loop will create num Radio Buttons rb[i]
private void btnBuildIt_Click(object sender, EventArgs e) {
int hsep = 40;
int num = (int)numUDCount.Value;
if (numUDCount.Value > 0)
Form1.ActiveForm.Height = num * hsep;
GroupBox gBox = new GroupBox();
gBox.Text = "Demo Group";
gBox.Size = new Size(200, 20 + num * hsep);
gBox.Location = new Point(20, 20);
this.Controls.Add(gBox);
for (int i = 0; i < num; i++)
rb.Add(new RadioButton());
rb[i].AutoSize = true;
rb[i].Location = new Point(15, 20 + hsep * i);
rb[i].Name = "radioButton" + Convert.ToString(i);
rb[i].Text = "This is Radio Button " + Convert.ToString(i);
gBox.Controls.Add(rb[i]); }
btnBuildIt.Enabled = false;
this loop will create num Radio Buttons rb[i]
Radio Buttons are separated by hsep in height
Radio Button rb[i] is added to gBox.Controls