if condition in aspx markup tag

Question

How do I set the value of primaryKey attribute in a gridview aspx markup bases on condition?

<% 
string val=string.Empty;
if(Id=1){
%>
val="red";
<% else { %>
val="blue";
<%} %>

<GridView runat="server" id="someid" PrimaryKey=val />

Answer 1

Your code have issues, you need to fix that.

Issue 1

if(Id=1){ Not correct , it should be if(Id==1){

Issue 2:

Propriety should not be PrimaryKey it should be DataKeyNames

Issue 3:

<GridView runat="server" id="someid" PrimaryKey=val />

It should be

 <asp:GridView runat="server" id="someid"  />

Instead of using a variable and using that for setting, you can do it like following.

          <% 
                string val = string.Empty;
                if (Id == 1)
                {
                    someid.PrimaryKey = "red";
                }
                else
                {
                    someid.PrimaryKey = "blue";
                }
            %>
            <asp:GridView runat="server" id="someid" />