How to retain text box values after postback in asp.net mvc - asp.net-mvc

Question

I have 2 form in the single view and below are the code.
#model MCRP.Models.tblRequest
#{
ViewBag.Title = "Review Request";
}
#using (Html.BeginForm("InsertForm", "Home"))
{
#Html.EditorFor(model => model.ContactEmailAddress, new { htmlAttributes = new {id = "txtdelivery"} })
<input type="submit" onclick="return validate();" value="submit" id="submitfilteration" class="btn btn-primary pull-left" />
}
#using (Html.BeginForm("Delete", "Home"))
{
Are you sure you want to delete Property ?
<input type="submit" value="Delete" class="btn btn-danger" />
}
But on click of delete button, the text inserted in the txtdelivery get disappear
Controller
public ActionResult ReviewRequest()
{
if (Session["AddtoCart"] != null)
{
DataTable dt = (DataTable)Session["AddtoCart"];
if (dt.Rows.Count > 0)
{
ViewBag.addedtocart = (DataTable)Session["AddtoCart"];
}
else
{
ViewBag.addedtocart = null;
ViewBag.EmptyCart = "Your Cart Is empty";
}
}
else
{
ViewBag.addedtocart = null;
ViewBag.EmptyCart = "Your Cart Is empty";
}
return View();
}
public ActionResult InsertForm(tblRequest Request)
{
int requestid = 0;
int RequestProperty = 0;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand("InsUpsDelTbl_Request"))
{
try
{
cmd.Connection = con;
cmd.CommandType = CommandType.StoredProcedure;
con.Open();
cmd.Parameters.AddWithValue("#Operation", "InsertRequest");
cmd.Parameters.AddWithValue("#AgencyName", Request.AgencyName);
cmd.Parameters.AddWithValue("#Contact", Request.Contact);
cmd.Parameters.AddWithValue("#DeliveryAddress", Request.DeliveryAddress);
cmd.Parameters.AddWithValue("#ContactPhone", Request.ContactPhone);
cmd.Parameters.AddWithValue("#ContactEmailAddress", Request.ContactEmailAddress);
cmd.Parameters.AddWithValue("#Notes", Request.Notes);
requestid = Convert.ToInt32(cmd.ExecuteScalar());
con.Close();
}
catch (Exception ex)
{ throw ex; }
}
using (SqlCommand cmd = new SqlCommand("InsUpsDelTbl_Request"))
{
DataTable dt = new DataTable();
dt = (DataTable)Session["AddtoCart"];
try
{
if (dt.Rows.Count > 0)
{
cmd.Connection = con;
cmd.CommandType = CommandType.StoredProcedure;
con.Open();
for (int i = 0; i < dt.Rows.Count; i++)
{
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("#Operation", "InsertRequestProperty");
cmd.Parameters.AddWithValue("#RequestID", requestid);
cmd.Parameters.AddWithValue("#PropertyID", dt.Rows[i]["PropertyId"].ToString());
cmd.Parameters.AddWithValue("#Quantity", dt.Rows[i]["Quantity"].ToString());
RequestProperty= Convert.ToInt32(cmd.ExecuteScalar());
}
con.Close();
if (requestid > 0 && RequestProperty>0)
{
TempData["InsertRequestProperty"] = ConfigurationManager.AppSettings["RequestAdded"].ToString().Replace("{#requestid}", Convert.ToString(requestid));
Session["AddtoCart"] = null;
}
}
}
catch (Exception ex)
{ throw ex; }
}
}
return RedirectToAction("ReviewRequest");
}
public ActionResult Delete(FormCollection property)
{
string PropertyID = "";
foreach (var key in property.AllKeys)
{
PropertyID = property["hddeleteGroupid"];
}
DataTable dt = new DataTable();
if (Session["AddtoCart"] != null)
{
dt = (DataTable)Session["AddtoCart"];
for (int i = dt.Rows.Count - 1; i >= 0; i--)
{
DataRow dr = dt.Rows[i];
if (dr[0].ToString() == PropertyID)
{
dt.Rows.Remove(dr);
}
}
Session["AddtoCart"] = dt;
}
return RedirectToAction("ReviewRequest");
}
As I am new in MVC I don't know please help me out
More Detail My page more detail is as shown in figure
Now on click of delete one popup with delete dialog gets open and on pressing of delete button one item added in the cart get deleted and also the text inserted in textbox get disappear,