How to Enter Placeholder Text Within Html.TextBoxFor in C# / MVC 4

Use an overload of TextBoxFor() with an htmlAttributes argument. This argument should be an anonymous object with all attributes you wish to assign to the input.

For example, if you want to set the placeholder and class attributes:

@Html.TextBoxFor( m => m.Email, new { placeholder = "Email", @class = "form-input" } )

Try to the following

This code is tested and it's working

@Html.TextBox("CustomarName" ,null, new { @class = "form-control" , @placeholder = "Search With Customar Name" })

Hope it helps to you

This works for me...

@Html.TextBoxFor(m => m.Username, new { @placeholder = "Username", @class = "input100" })