Web Forms :: Call A Code Behind Function Form Html Source Code?

I want to call a function present in code behind from front page (html : source code)

i want to use like this:

Source code

<a href='<%# linkAlpha("B").ToString()) %>' title="B" id="B_List" runat = "server">B</a>

Code Behind

protected string linkAlpha(string value)
{
// /market-research/<%#Eval("customname")%>/
string str = "";
if (Request.Url.DnsSafeHost == "localhost")
{ // /market-reports/<%# Eval("customname")%>/
str = "Alpha_Category.aspx?q=" + value.ToString().Trim();
// Response.Redirect("Alpha_Category.aspx?q=" + value.ToString().Trim());
}
else
{
// str = "/market-reports/" + value.ToString().Trim() + "/";
str = "/Alpha_Category.aspx?q=" + value.ToString().Trim();
}
return str;
}