Modify <param> value from code

I am trying to embed a visio doc in an aspx page using the following code

<OBJECT classid="CLSID:279D6C9A-652E-4833-BEFC-312CA8887857" 
codebase="http开发者_StackOverflow中文版://download.microsoft.com/download/4/5/2/452f8090-413f-408f-83c0-edd66db786ee/vviewer.exe" 
id="viewer1" width="100%" height="100"> 
<param name="BackColor" value="16777120">
<param name="AlertsEnabled" value="1">
<param name="ContextMenuEnabled" value="1">
<param name="GridVisible" value="0">
<param name="HighQualityRender" value="1">
<param name="PageColor" value="16777215">
<param name="PageVisible" value="1">
<param name="PropertyDialogEnabled" value="1">
<param name="ScrollbarsVisible" value="1">
<param name="ToolbarVisible" value="1">
<param name="SRC" value="http://wssxxxx/Shared%20Documents/Yukon%20Timeline.vsd">
<param name="CurrentPageIndex" value="0">
<param name="Zoom" value="-1">
</object>

i need to modify the value parameter SRC from code , how do i go about it ?

Use a code block:

<param name="SRC" value="<%:MyValue%>"> 

Or this (if not using .NET 4.0):

<param name="SRC" value="<%=Server.HtmlEncode(MyValue)%>"> 

In your page, you can create a string property called MyValue:

public string MyValue { get; set; } 

And set it in code to whatever you need:

// In page_load
MyValue = "http://example.com/code_blocks.vsd";

You can have it run at server:

<param name="SRC" id="prmSrc" runat="server" />

And in your code behind:

prmSrc.Attributes["value"] = "...";