i click one checkbox other checkbox will disable in datalist

i have many checkbox in datalist.when i click one checkbox then other
checkbox will be disable. how i will solve it by asp.net using csharp.

here is my code sample:

RepeatDirection="Horizontal"
Width="50%" BorderColor="#336699" BorderStyle="Solid" BorderWidth="2px" >


Font-Size="10pt" ForeColor="#336699" Width="100%" />


ImageUrl='<%# "GetImage.aspx?id=" + Eval("ProductID") %>' />
oncheckchanged="CheckedChanged" />