How to complete flush the eval using javascript

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C#

ASP.NET

I'm wondering if it's possible to flush the value of eval on javascript using button's OnClientClick. I just wanted to clean the Eval of my Literal because whenever I try to access the same path file also being given by data key discussion_material_location. It always says that I cannot open the file since it's being used on other process. I tried using the keyword using for this one but it seemed that it didn't work too. any suggestions?

What I have tried:

<asp:Literal ID="videoshow" runat="server" Text='<%#Eval("discussion_material_location") %>' ></asp:Literal>