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    <p>Here is the code from the MVC Source for the textbox:</p> <pre><code> string attemptedValue = (string)htmlHelper.GetModelStateValue(name, typeof(string)); tagBuilder.MergeAttribute("value", attemptedValue ?? ((useViewData) ? htmlHelper.EvalString(name) : valueParameter**), isExplicitValue); break; </code></pre> <p>And the Code for GetModelStateValue()</p> <pre><code> internal object GetModelStateValue(string key, Type destinationType) { ModelState modelState; if (ViewData.ModelState.TryGetValue(key, out modelState)) { if (modelState.Value != null) { return modelState.Value.ConvertTo(destinationType, null /* culture */); } } return null; } </code></pre> <p>So what happens is the Html "Helper" looks for the text box value, by matching the name, in your ViewData.ModalState, if its in the ModelState dictionary, it <strong>completely ignores</strong> the value you provided.</p> <p>So all that if (value > 0) { ValueA = 0; } doesn't matter because its going to use the posted values in ModelState if the names match.</p> <p>The way I've fixed this is to blow away the ModalState before the view renders for certain values that I want to mess with in my view models. This is some code I've used:</p> <pre><code> public static void SanitizeWildcards( Controller controller, params string[] filterStrings ) { foreach( var filterString in filterStrings ) { var modelState = controller.ModelState; ModelState modelStateValue; if( modelState.TryGetValue(filterString,out controller.ModelState.SetModelValue(filterString, new ValueProviderResult("","", null)); } } </code></pre>
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    1. COThanks for the insight jfar! Based on your response, I chucked the textbox helpers used html inputs instead. There were only two inputs on my form that needed this behavior, so I went for simplicity over having to walk through the ModelState dictionary. Your post was very insightful and led me to the solution though, so thanks again!
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      1. USJonathan Moosekian
    2. COThanks! This was a big help to me also.
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    3. CODo you have any idea why Microsoft implemented the `HTML helper` TextBox this way?
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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