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POLINQ Query problem. Need to check if exists
 

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    <p>I have 3 fields: <code>urlName</code>, <code>displayName</code> and <code>active</code>. This is check for edit record. What I want to do here is to check <code>UrlName</code> is unique in Db, but at the same time, if user has already saved the Url but changed <code>DisplayName</code> and <code>Active</code> then the record should update.</p> <p>Any one tell me how to solve that.</p> <pre><code>public bool NothingExceptUrlNameExists(string urlName, string displayName, bool active) { return (from p in _db.SubMenus where p.UrlName == urlName &amp;&amp; (p.DisplayName != displayName || p.DisplayName == displayName) &amp;&amp; (p.Active != active || p.Active == active) select p).Any(); } </code></pre> <p>updating record like </p> <pre><code> TryUpdateModel(existingMenu); _menu.Add(); </code></pre> <p><strong>This is what I want to achieve</strong></p> <p>My other 2 values should be added in Query DisplayName and Active. Suppose "Contact" UrlName already in DB. I am loading values from dropdown returning UrlName="About", DisplayName="About Us", Active = true. Now editing record. Here are the condition to match. </p> <p>1 - UrlName="About", DisplayName="About Test", Active = true --> This should update. </p> <p>2 - UrlName="About", DisplayName="About Us", Active = false --> This should update.</p> <p>3 - UrlName="About", DisplayName="About Test", Active = false --> This should update. </p> <p>Important : 4 - UrlName="newnotexist", DisplayName="About test", Active = false --> <strong>This should update UrlName and rest if changed.</strong> </p> <p>5 - UrlName="Contact", DisplayName="About Test", Active = false --> <strong>This should not update and generate error.</strong> </p> <p>I hope you understand what I want to do.</p>
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    1. CO`(p.DisplayName != displayName || p.DisplayName == displayName)` and `(p.Active != active || p.Active == active)` will always be true. Also it's not very clear as to what you are trying to achieve. Can you rephrase/elaborate ?
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    2. CO@Bala R , Thanks for the reply. This is for Edit form. UrlName is unique in DB but DisplayName and Active are not. I have form with these 3 fields. You load 3 fields from selecting dropdown. Now he wants to edit DisplayName and Active with same UrlName than it should update. In another scenario he wants to change urlname different than what is load (might change other values) but not unique and try to save it which should give error. I hpe its clear now?
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