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    <p>What is not working? What are you storing in the <code>Session["SubCategory"]</code>?</p> <p>These tests pass when storing string representing the ID in the session object:</p> <pre><code>[Test] public void GivenWhenIntegerString_WhenTryParse_ThenValidInteger() { Dictionary&lt;string, Object&gt; fakeSession = new Dictionary&lt;string, object&gt;(); fakeSession["SubCategory"] = "5"; decimal tmp; decimal? IdSubCategory = null; if (decimal.TryParse((string)fakeSession["SubCategory"], out tmp)) IdSubCategory = tmp; Assert.That(IdSubCategory, Is.EqualTo(5d)); } [Test] public void GivenWhenNull_WhenTryParse_ThenNull() { Dictionary&lt;string, Object&gt; fakeSession = new Dictionary&lt;string, object&gt;(); fakeSession["SubCategory"] = null; decimal tmp; decimal? IdSubCategory = null; if (decimal.TryParse((string)fakeSession["SubCategory"], out tmp)) IdSubCategory = tmp; Assert.That(IdSubCategory, Is.EqualTo(null)); } </code></pre> <p>This test fails when you store the <code>int</code> or <code>decimal</code> in <code>Session["SubCategory"]</code></p> <pre><code>[Test] public void GivenWhenInteger_WhenTryParse_ThenValidInteger() { Dictionary&lt;string, Object&gt; fakeSession = new Dictionary&lt;string, object&gt;(); fakeSession["SubCategory"] = 5; decimal tmp; decimal? IdSubCategory = null; if (decimal.TryParse((string)fakeSession["SubCategory"], out tmp)) IdSubCategory = tmp; Assert.That(IdSubCategory, Is.EqualTo(5d)); } </code></pre> <p>In this case, this will fix it:</p> <pre><code>decimal tmp; decimal? IdSubCategory = null; if (Session["SubCategory"] != null &amp;&amp; decimal.TryParse(Session["SubCategory"].ToString(), out tmp)) IdSubCategory = tmp; </code></pre>
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    1. POAssign null to decimal MVC 3
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    1. USLuke Hutton
    1. USLuke Hutton
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