只能选择GridView中的一个CheckBox(单选CheckBox)

方法一：

protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
    {
              CheckBox cbx = e.Row.FindControl("cbID") as CheckBox;
        try
        {
            //绑定选中CheckBox 客户端ID
            cbx.Attributes.Add("onclick", "Change(" + cbx.ClientID + ")");
        }
        catch
        {
        }

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes.Add("onmouseover", "currentcolor=this.style.backgroundColor;this.style.backgroundColor ='#6699ff'");
            e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor =currentcolor");
        }
    }

后台源中

<script type="text/javascript">
        function Change(SCheckBox) {
            //找到页面所有 input
            var objs = document.getElementsByTagName("input");
            for (var i = 0; i < objs.length; i++) {
                //找到input中的checkbox
                if (objs[i].type.toLowerCase() == "checkbox")
                //所有checkbox为false
                    objs[i].checked = false;
            }
            //找到选中checkbox
            var SelectCheckBoxID = SCheckBox.id;
            //选中checkbox为true
            document.getElementById(SelectCheckBoxID).checked = true;
        }
</script>

方法二：

//识别不同的浏览器 
    function getTargetElement(evt) {
        var elem
        if (evt.target) {
            elem = (evt.target.nodeType == 3) ? evt.target.parentNode : evt.target
        }
        else {
            elem = evt.srcElement
        }
        return elem
    }

    var lastD = null;
    function Change(evt) {
        evt = (evt) ? evt : ((window.event) ? window.event : " ");
        if (evt == " ") {
            return;
        }
        var obj = getTargetElement(evt);
        var hasTreeNode = false;
        if (obj.tagName) {
            if (obj.tagName == "INPUT" && obj.type == "checkbox") {
                if (lastD) lastD.checked = false
                lastD = obj;
                obj.checked = true;

            }
        }
    }

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
         try
        {
               GridView1.Attributes.Add("onclick", "Change(event)");

        }
        catch
        {
        }


    }