'TreeNode' is not a known element

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<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls" %>

<iewc:TreeView ID="tvMenuTree" runat="server" >
    <iewc:TreeNode  Text="Help" ID="Help">
        <iewc:TreeNode  Text="Update"></iewc:TreeNode>
        <iewc:TreeNode  Text="Domains"></iewc:TreeNode>
        <iewc:TreeNode  Text="Sources"></iewc:TreeNode>
        <iewc:TreeNode  Text="Terms" ></iewc:TreeNode>
        <iewc:TreeNode  Text="Search for Terms"></iewc:TreeNode>
    </iewc:TreeNode>
</iewc:TreeView>

Element 'TreeNode' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing.
Help me to solve this problem

Posted 17-Jan-11 20:26pm

swathi.N

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Kasson 18-Jan-11 2:30am

What error it shows.

swathi.N 18-Jan-11 3:34am

Reply- It shows only warning "Element 'TreeNode' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing"
.
When I execute the application,TreeView part is not visible in the browser. - swathi.N 12 mins ago

Shahriar Iqbal Chowdhury/Galib 18-Jan-11 3:18am

which asp.net version you are using? Why you are using assembly ref? TreeView is a built in component. use asp:TreeView instead, if you extend TreeView to customize then you should use your custom class ref , not base class ref.

swathi.N 18-Jan-11 3:24am

I am using 2.0 version

3 solutions

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jerrykid · Answer 1 · 2011-01-17T21:18:00

swathi,

<iewc:treeview xmlns:iewc="#unknown" />

what I saw is a WebUserControl, right? I saw that you forgot the Nodes property

Please try:

C#

<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls" %>
<iewc:TreeView ID="tvMenuTree" runat="server" >
<nodes>
    <iewc:TreeNode  Text="Help" ID="Help">
        <iewc:TreeNode  Text="Update"></iewc:TreeNode>
        <iewc:TreeNode  Text="Domains"></iewc:TreeNode>
        <iewc:TreeNode  Text="Sources"></iewc:TreeNode>
        <iewc:TreeNode  Text="Terms" ></iewc:TreeNode>
        <iewc:TreeNode  Text="Search for Terms"></iewc:TreeNode>
    </iewc:TreeNode>
</Nodes>
</iewc:TreeView></nodes>

If it's still not help you, please try:

XML

<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls" %>
<iewc:TreeView ID="tvMenuTree" runat="server" >
<nodes>
    <asp:TreeNode  Text="Help" ID="Help">
        <asp:TreeNode  Text="Update"></asp:TreeNode>
        <asp:TreeNode  Text="Domains"></asp:TreeNode>
        <asp:TreeNode  Text="Sources"></asp:TreeNode>
        <asp:TreeNode  Text="Terms" ></asp:TreeNode>
        <asp:TreeNode  Text="Search for Terms"></asp:TreeNode>
    </asp:TreeNode>
</iewc:TreeView>
</nodes>

Kasson · Answer 2 · 2011-01-17T21:41:00

Solution 2

Did you try changing the tagprefix in the config file? That fixed the problem for me.

Posted 17-Jan-11 21:41pm

Kasson

Comments

m@dhu 18-Jan-11 4:55am

Probably this should be a comment rather than posting as an answer.

Anupama Roy · Answer 3 · 2011-01-17T22:51:00

Solution 3

Take a look at this.It may help you!

http://blog.tentaclesoftware.com/archive/2010/07/21/95.aspx[^]

Posted 17-Jan-11 22:51pm

Anupama Roy