VB.NET - how to uncheck already selected radiobutton

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if you place only one check box on Form even its checked Property is False It will be checked ..initially

but you can unchecked it using code

You can use javascript for this purpose:

function clearRadioButton(rbName) {
   options = document.getElementsByName(rbName);

    for (var i=0; i < options.length; i++) {
        options[i].checked = false;
    }
}

Regards,
http://www.sql-server-helper.com/sql-server-2008/row-value-constructor-as-derived-table.aspx

radio box are mainly used to select one item from many items.

so we needed to check atleast one in the form,if we use radio button.

otherwise, we can make use of checkboxes. so user can select or not!!!!

if you want to unselect using coding than

radioButton1.Checked = false;