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    <p>If you are using C# 4, use default value for optional parameter</p> <pre><code>public ActionResult Organic(int id = 0)//Store/Organic { ProductManager mgr = new ProductManager(); var list = mgr.IsOrganic(id); return View(list); } </code></pre> <p>If C# 3 only, use DefaultValue attribute for optional parameter</p> <pre><code>public ActionResult Organic( [System.ComponentModel.DefaultValue(0)] int id) //Store/Organic { ProductManager mgr = new ProductManager(); var list = mgr.IsOrganic(id); return View(list); } </code></pre> <p>But I'm wondering why you are calling Organic method that way, that is with no parameter.</p> <p>If you want to test if the StoreController's Organic action is working, type this in url:</p> <p><a href="http://localhost/Store/Organic/7" rel="nofollow">http://localhost/Store/Organic/7</a></p> <p>or this:</p> <p><a href="http://localhost/Store/Organic?id=7" rel="nofollow">http://localhost/Store/Organic?id=7</a></p> <p>If you used custom name for the parameter id of your StoreController's Organic action, say organicId:</p> <pre><code>public ActionResult Organic(int organicId = 0) //Store/Organic?organicId=7 { ProductManager mgr = new ProductManager(); var list = mgr.IsOrganic(id); return View(list); } </code></pre> <p>,this url will not work: <a href="http://localhost/Store/Organic/7" rel="nofollow">http://localhost/Store/Organic/7</a></p> <p>,that will not have runtime error, but the organicId value won't be passed a value, and as such will always have a value of 0</p> <p>,you must use this instead: <a href="http://localhost/Store/Organic?organicId=7" rel="nofollow">http://localhost/Store/Organic?organicId=7</a></p> <p>By the way, where does the runtime error come from? Upon clicking a link? Try to hover on that link and look at your browser's status bar, yourl URL must conform to this: <a href="http://localhost/Store/Organic/7" rel="nofollow">http://localhost/Store/Organic/7</a> or this <a href="http://localhost/Store/Organic?id=7" rel="nofollow">http://localhost/Store/Organic?id=7</a>. </p> <p>If it doesn't look that way, change your ActionLink to this:</p> <p><code>@Html.ActionLink("Store", "Organic", new {id = 7})</code></p> <p>or if you are using plain HTML:</p> <pre><code>&lt;a href="Store/Organic/7"&gt; </code></pre> <p>Or this:</p> <pre><code>&lt;a href="Store/Organic?id=7"&gt; </code></pre>
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    1. PO"Parameters dictionary contains null for parameter of non-nullable type"?
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    1. PO"Parameters dictionary contains null for parameter of non-nullable type"?
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    1. COThanks for the reply. I did some thing and I may have fixed that id error. I am now getting this error when I run it, doing /store/organic An attempt to attach an auto-named database for file C:\Users\MYNAE.UNI\Dropbox\WebDev2\Project (Final)\NewProj3\NewProj3\App_Data\StoreDB.sdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share. This is in my AbstractDatabase.cs
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    2. COBut the database file is in that location, I doubled checked =\
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    3. CO"Thanks for the reply. I did some thing and I **may** have fixed that id error." ツ Shouldn't the problem be [reproducible](http://blog.sobbayi.com/a-run-down-of-the-best-computer-programmer-jokes/), so one shall know how to fix it again when he/she encounter the same kind of error? You can post your db problem on separate question, it also may have a higher chance of being solved in http://serverfault.com/ or http://dba.stackexchange.com/ both sister sites of http://stackoverflow.com
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