Master Page表单标签runat = server(Master Page form tag runat = server)

 我将一个链接按钮拖到我的母版页中，然后我尝试运行它，它说我应该放一个表格标签runat = server，在我说之后，它说我只能有一个表格标签，但我检查我的materpage，不要有任何形式标签.. 
 
<asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click">Logout</asp:LinkButton>
 
 我的其他页面有runat = server的表单标签，因为当我尝试它时，他们告诉我要添加它，我做错了什么以及我该如何纠正它 
 
 我的完整母版页： 
 

i drag a linkbutton into my masterpage and i try to run it , it says i should put a form tag runat = server , after i put it , it says that i can only have 1 form tag , but i check my materpage , don't have any form tag ..
 
<asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click">Logout</asp:LinkButton>
 
My other pages have form tag of runat = server because when i try it , they told me to add it in , What have i done wrong and how should i correct it
 
My full master page : 
 

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