Retrieving query parameters within MVC view

Use:

<input type="text" class="form-control" id="search" value="@Request.QueryString["Title"]" />

For a cleaner separation between models, view, and controllers it would be recommended that the controller send the title to the view. But this is fine as well.

Your best option would be to bind these values to action parameters in the Index action and add them to the view model. Some variation of the following should see you through:

public ActionResult Index(string title, string language)
{
    var model = new PublishIndexViewModel { Title = title, Language = language };
    return View(model);
}

Then in your view:

@model PublishIndexViewModel

...

<input type="text" class="form-control" id="search" value="@Model.Title" />

This more in-keeping with ASP.NET MVC's "best practice" patterns than - and is preferable to - handling Request.QueryString directly and can be easily accommodated into any existing view models you already have.

@AntP is correct. The preferred method for MVC is to have the action accept the parameters. However, failing that, you should use:

Request.Unvalidated["myParam"]

Which will always return the parameter whether it was passed as part of the URL path or query string, and whether or not it was accepted as a parameter to the action method. It's pretty much a catch all that will guarantee the value is returned no matter how it was handled.

The .Unvalidated portion is to turn off model validation which is kind of stupidly run any time you try to pull anything from just the Request object, by itself.