Asp.net Radio Button control

asp:RadioButton control

RadioButton control is utilized to give single select alternative to the client from different things.

RadioButton control is used to give single select option to the user from multiple items. When it is rendered on the page, it is implemented through <input type=radio></input> HTML tag. Its properties like BackColor, ForeColor, BorderColor, BorderStyle, BorderWidth, Height etc. are implemented through style properites of <input>

Following are some important properties that are very useful.

AutoPostBack	Form is automatically posted back when Radio button selection is changed.
CausesValidation	true/false. If true, Form is validated if Validation control has been used in the form.
Checked	true/false. If true, Radio button is selected by default.
OnCheckedChanged	Fires when Radio button selection changes. This works only if AutoPostBack property is set to true.
ValidationGroup	Used to put a radio button under a particular validation group. It is used when you have many set of form controls and by clicking a paricular button you want to validate a particular set of controls only.
GroupName	It is used a group a set of radion buttons so only one of them can be selected at a time.

1st set of Radio buttons without AutoPostBack Red Blue Green 2nd set of Radio buttons with AutoPostBack Red Blue Green

// 1st set of Radio buttons without AutoPostBack
                        <asp:RadioButton ID="RadioButton7" runat="Server" GroupName="1stGroup" Text="Red" Checked="True"  />
                        <asp:RadioButton ID="RadioButton8" runat="Server" GroupName="1stGroup" Text="Blue"  />
                        <asp:RadioButton ID="RadioButton9" runat="Server" GroupName="1stGroup" Text="Green" />
                   
                        // 2nd set of Radio buttons with AutoPostBack
                        <asp:RadioButton ID="RadioButton10" runat="Server" GroupName="2ndtGroup" Text="Red" Checked="True" OnCheckedChanged="FireOnCheckedChanged" AutoPostBack="true" />
                        <asp:RadioButton ID="RadioButton11" runat="Server" GroupName="2ndtGroup" Text="Blue" OnCheckedChanged="FireOnCheckedChanged" AutoPostBack="true" />
                        <asp:RadioButton ID="RadioButton12" runat="Server" GroupName="2ndtGroup" Text="Green" OnCheckedChanged="FireOnCheckedChanged" AutoPostBack="true" />                     
   
                    

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