Radio Button And RadioButton List

Radio Button

Source

<asp:RadioButton ID="rdA" runat="server" Text="A" /> 

<asp:RadioButton ID="rdB" runat="server" Text="B" />

<asp:Button ID="btnRdBtn" runat="server" OnClick="Button2_Click" Text="Test"/>
<asp:TextBox ID="txtRdCheck" runat="server"></asp:TextBox>

C#

  protected void btnRdBtn_Click(object sender, EventArgs e)

        {

            if (rdA.Checked && rdB.Checked)

            {

                txtRdCheck.Text = "AB";

            }

            else

            {

                if (rdA.Checked)

                {

                    txtRdCheck.Text = "A";

                }

                if (rdB.Checked)

                {

                    txtRdCheck.Text = "B";

                }

            }

        }

RadioButton List

Source
 

asp:RadioButtonList ID="rdBtn" runat="server" Style="font-weight: 700" Width="69px">

<asp:ListItem Value="1">A</asp:ListItem>

<asp:ListItem Value="2">B</asp:ListItem>

<asp:ListItem Value="3">C</asp:ListItem>

</asp:RadioButtonList>

<asp:Button ID="btnTst" runat="server" OnClick="btnTst_Click" Text="Test" />

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

                   

C#

 

protected void btnTst_Click(object sender, EventArgs e)

        {

            TextBox1.Text = rdBtn.SelectedItem.Text;

        }