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POMemory usage in Winforms
 

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  1. POMemory usage in Winforms
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    <p>I have very simple application of two forms (created to test memory). Solution has three projects. 1st having forms, 2nd DAL and 3rd <code>ComonLib</code>.</p> <p><em><strong>(All these memory figures are from Task Manager. At the end of the question there are 4 urls of images of memory-profiler)</em></strong></p> <p>When I run my app the memory usage is around <code>8MB</code>. This form only have two buttons. One button is to open 2nd form and another button to collect <code>GC</code>.</p> <p>When I open 2nd form the memory increase to around <code>550MB</code>. This form has a grid and data (<code>1000s of records</code>) loads in this grid in Load event.</p> <p>Code to open 2nd form.</p> <pre><code>CallWidnows cw = new CallWidnows(); cw.ShowDialog(); cw.Dispose(); </code></pre> <p>Load event of 2nd form</p> <pre><code>Customers customers = new Customers(); dataGridView1.DataSource = customers.GetAllCustomers(); </code></pre> <p>Close event of 2nd form.</p> <pre><code>dataGridView1.Dispose(); </code></pre> <p>But after closing 2nd form no change in memory usage, and memory usage is still 550MB</p> <p>After waiting a minute or so I explicitly call <code>GC.Collect()</code> and only few MBs of memory releases and become to <code>530MB</code></p> <p>Again after waiting a minute or so I agin call <code>GC.Collect()</code> and now memory come down to <code>40MB</code></p> <ul> <li><p>Can anyone help me to understand this memory usage behavior?</p></li> <li><p><strong>Why on disposing form and grid memory is not released?</strong></p></li> <li>Why on 2nd time calling <code>GC.Collect()</code> all the memory released but not when I called it first time?</li> </ul> <p>My original application has dozens of forms and user controls and I am going through memory problem in this app.</p> <ul> <li>Can anyone suggest few steps to analyze memory usage in Winforms app?</li> </ul> <p>One side quetion: Originally I had following method as static method.</p> <pre><code>Customers customers = new Customers(); dataGridView1.DataSource = customers.GetAllCustomers(); </code></pre> <p>It was like </p> <pre><code>// Static GetAllCustomers method dataGridView1.DataSource = Customers.GetAllCustomers(); </code></pre> <ul> <li>In my original application all DAL methods are static. Static methods can be reason of Memory Leak when used like above?</li> </ul> <p>Memory Profiler Images:</p> <p><a href="http://img839.imageshack.us/i/firstimagedialog.png/" rel="nofollow">1- Application Starts Memory usage 8MB</a></p> <p><a href="http://img859.imageshack.us/i/secondimagedialog.png/" rel="nofollow">2- Second form opens and data loaded - Memory Usage - 550MB</a></p> <p><a href="http://img857.imageshack.us/i/thirdimagedialog.png/" rel="nofollow">3- Second form closed. Form disposed and grid disposed - Memory Usage still - 550 MB</a></p> <p><a href="http://img846.imageshack.us/i/fourthimagedialog.png/" rel="nofollow">4- First time GC.Collect called.</a></p> <p>Thanks.</p>
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    1. COpossible duplicate of [Memory Leaks in Winforms application.](http://stackoverflow.com/questions/3891567/memory-leaks-in-winforms-application)
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      1. USHans Passant
    2. COThis is just not how garbage collection works. It doesn't free the memory immediately. See [my answer](http://stackoverflow.com/questions/5191897/how-to-release-the-occupied-memory/5192350#5192350) to [this question](http://stackoverflow.com/questions/5191897/how-to-release-the-occupied-memory).
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      1. USCody Gray
 

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