form的id改成name,button的name和text的name重复了,也要改
<form name="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click1" />
<input id="Button2" name="c" type="button" value="button" onclick ="a()"/>
<input id="Text1" name="b" type="text" value="aaa" />
</form>
<form name="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click1" />
<input id="Button2" name="c" type="button" value="button" onclick ="a()"/>
<input id="Text1" name="b" type="text" value="aaa" />
</form>
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