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POSimple question about how static variables work in ASP.NET?
 

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  1. POSimple question about how static variables work in ASP.NET?
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    <p>I have a map which displays some info. By default, labels on the map are turned off. There is an image button which has a turned-off image associated with it when you the labels are off and a turned-on image associated with it when you turn the labels on. I have the code working, but I wanted a better reason as to why it works this way. Here is a snippet of code.</p> <p>If I declare a class-level boolean variable showLabels like:</p> <pre><code>private bool showLabels = false; </code></pre> <p>and then have the following code:</p> <pre><code>if(showLabels == false) { showLabels = true; imgShowLabels.ImageUrl = "label-on.png"; } else { showLabels = false; imgShowLabels.ImageUrl = "label-off.png"; } </code></pre> <p>When I run it, the map comes up with the labels not shown by default. When I click on the Show Labels button, the variable showLabels becomes true and the image is changed to label-on.png, but when I click it again, the showLabels variable is reset to false, so nothing happens.</p> <p>So what I did was change it from:</p> <pre><code>private bool showLabels = false; </code></pre> <p>to</p> <pre><code>private static bool showLabels = false; </code></pre> <p>and it is working this way.</p> <p>Is this the correct way to handle this type of scenario?</p> <p>In the class level, I put the property:</p> <pre><code>public bool ShowLabels { get { return (bool)ViewState["ShowLabels"]; } set { ViewState["ShowLabels"] = value; } } </code></pre> <p>In the if(!Page.IsPostBack), I am setting ShowLabels to false;</p> <p>Then in my if statement, I am doing:</p> <pre><code>if(ShowLabels == false) { ShowLabels = true; imgShowLabels.ImageUrl = "label-on.png"; } else { ShowLabels = false; imgShowLabels.ImageUrl = "label-off.png"; } </code></pre> <p>But ShowLabels is always false, I thought by setting the ViewState through the property ShowLabels, it would retain its value.</p>
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