Html.TextAreaFor in asp.net mvc

I have a asp.net mvc view that allows the user to enter some description in a textarea.

There are two problems that I am facing.

Either when I expand the textarea it is expanding without moving other html elements or I am not able to make create a Html.TextBoxFor () multiline textbox. Can anyone suggest a solution to this? If Use Textarea how to make it expand(grow in size) so that it does not overlap with other elements or how to use Html.TextBoxFor() for multiline?

This is how my code looks like

<% using (Html.BeginForm())
        { %>
     <开发者_高级运维%: Html.ValidationSummary(true)%>

    <fieldset>

        <div class="editor-label1">
            <%: Html.LabelFor(Model => Model.PackageID)%>
        </div>
        <div class ="editor-field1">
             <%: Html.HiddenFor(Model => Model.PackageID)%>
              <%: Html.DisplayFor(Model => Model.PackageID)%>
             <%: Html.ValidationMessageFor(Model => Model.PackageID)%>
        </div>

         <div class="editor-label1">
            <%: Html.LabelFor(Model => Model.PackageName)%>
        </div>
        <div class ="editor-field1">
            <%: Html.TextBoxFor(Model => Model.PackageName)%>
            <%: Html.ValidationMessageFor(Model => Model.PackageName)%>
        </div>

        <div class="editor-label1">
            <%: Html.LabelFor(Model => Model.PackageDesc)%>
        </div>
        <div class ="editor-field1" style= "padding-bottom: 50px; margin-bottom: 150px">
            <%: Html.TextBoxFor(Model => Model.PackageDesc, new { TextMode = TextBoxMode.MultiLine, cols = "55", rows = "10" })%>

            <%: Html.ValidationMessageFor(Model => Model.PackageDesc)%>
        </div>

         <div class="editor-label1">
            <%: Html.LabelFor(Model => Model.PackageTitle)%>
        </div>
        <div class ="editor-field1">
            <%: Html.TextBoxFor(Model => Model.PackageTitle)%>
            <%: Html.ValidationMessageFor(Model => Model.PackageTitle)%>
        </div>
        <div class ="editor-label">
            <%: Html.Label("Project ID") %>
        </div>
        <div class="editor-field">
            <%:Html.DropDownList("ProjectID", (IEnumerable<SelectListItem>)ViewData["projects"])%>
        </div>
         <div>
                <input type="submit" value="Save Edit" />
         </div>
    </fieldset>
    <% } %>

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Use the code below when using Razor

   @Html.TextAreaFor(model => model.Comments, 10, 40, null);

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Rendering TextArea using ASP.NET MVC's Html helper and making it resizable are two different concerns. When using Html helper you can add a class to textarea like

<%:Html.TextAreaFor(x => x.SomeProperty, new { @class = "resizer" }) %>

Then you can hook this class with jQuery to make it resizable when it's rendered on the web page. Please refer to Implementing a resizable textarea? for information about making your textarea resizable.

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Even better, if you want auto-calculate number of the rows in the textarea you can use this

@Html.TextAreaFor(m => m.Comments, Model.Comments.Count + 1, 40, null)