get提交的时候，如何将表单中控件的值传递给另一个表单？

<body>
    <form id="form1" method="get" action="Main.aspx">
    <div>
    
        <table class="style1" align="center">
            <tr>
                <td>
                    用户名:
                </td>
                <td>
                    <input id="txtUserName" type="text" /></td>
            </tr>
            <tr>
                <td>
                    密码:
                </td>
                <td>
                    <input id="txtUserPwd" type="text" /></td>
            </tr>
            <tr>
                <td>
                    &nbsp;</td>
                <td>
                    <input id="Submit1" type="submit" value="提交" /></td>
            </tr>
        </table>
    
    </div>
    </form>
</body>
如何将控件txtUserName和txtUserPwd的值传递给表单Main.aspx