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Now since the form will be submitted to the Saveenter code hereForm action method, you can use the same view model as your method parameter.

Now since the form will be submitted to the Save Form action method, you can use the same view model as your method parameter.

[HttpPost]
public ActionResult SaveForm(FormContent model)
{
  // to do : return something
}

[HttpPost]
public ActionResult SaveForm(YourFormContentViewModel model)
{
  // to do : return something
}

<form action="@Url.Action("SaveForm", "FormsCreator")" method="post">
    <textarea class="form-control" id="mytextarea" name="mytextarea">Next, start a free trial!</textarea>
    <input type="hidden" id="formName" name="formName" required />
   <button  type="button" class="btn btn-primary" onclick="openModal();">Save</button>
</form>
<div class="modal fade" id="saveForm" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button aria-hidden="true" data-dismiss="modal" class="close" type="button">X</button>
            </div>
            <div class="modal-body">
                <input type="text" id="formNameTemp"  required />
            </div>
            <div class="modal-footer">
                <button data-dismiss="modal" class="btn" id="btn-save" type="button">Save</button>
                <button data-dismiss="modal" class="btn btn-primary" type="button">Close</button>
            </div>
        </div>
    </div>
</div>

<form action="@Url.Action("SaveForm", "FormsCreator")" method="post">
    <textarea class="form-control" id="mytextarea"
              name="mytextarea">Next, start a free trial!</textarea>
    <input type="hidden" id="formName" name="formName" required />
   <button  type="button" class="btn btn-primary" onclick="openModal();">Save</button>
</form>
<div class="modal fade" id="saveForm" tabindex="-1" role="dialog"
                                      aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button aria-hidden="true" data-dismiss="modal" class="close" 
                                           type="button">X</button>
            </div>
            <div class="modal-body">
                <input type="text" id="formNameTemp"  required />
            </div>
            <div class="modal-footer">
                <button data-dismiss="modal" class="btn" id="btn-save"
                                             type="button">Save</button>      
                <button data-dismiss="modal" class="btn" type="button">Close</button>
            </div>
        </div>
    </div>
</div>