About the value problem in the server side in HTML

Yesterday did the tree to add a node with of the tree type, today, but found in the .aspx.cs background code, the value of SEL Use relquest.form ["SEL"]

After using Runat = Server, use for (int32 i = 0; i

It also can't get its value.

My

is added with JavaScript on the client response Checkbox on -click. I found a related thing on 9CBS, I see that it may be because the client / server does not know each other. Question, but why add Runat = Server

                                     =

  Seeing a friend's solution is to use a to set the value of , try it is ok. This is good, at least I will not take Yesterday. Things to implement with , all of them use C # to write once.

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In short, the operation mode of the ASP.NET page is still unclear, and there will be a lot of summary in the future.

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