How to preserve model values during postback? - asp.net-mvc

Question

I have a model:
public class EmployeeDetails
{
public int staffcode { get; set; }
public string name { get; set; }
public string designation { get; set; }
public string department { get; set; }
}
On click of Search button, employee details are fetched from the database and model properties are initialized. These values are also shown on the View.
dtEmpDetails = lib.RunSP("GetEmpDetails", lstEmpDetails);
leaveBalanceViewModel.EmployeeDetail.staffcode = Convert.ToInt32(staffCode);
leaveBalanceViewModel.EmployeeDetail.name = dtEmpDetails.Rows[0][0].ToString();
leaveBalanceViewModel.EmployeeDetail.designation = dtEmpDetails.Rows[0][1].ToString();
There is another button Save. When I click Save, the Textbox values from the View get lost because again a Submit is happening.
How can I store the model property values and keep it available during postbacks?
** Edited **
View Code is as below:
<div>
#using (Html.BeginForm("Search", "AFLeaveBalance",FormMethod.Get))
{
<table style="border:none">
<tr>
<td style="border:none">Enter staff code</td>
<td style="border:none">#Html.TextBox("staffcode", "", new { width = "100" })</td>
<td style="border:none"><input type="submit" value="Get Details" /></td>
</tr>
</table>
}
<br /><hr />
<table id="tblEmpDetails">
<tr>
<td style="background-color:#d2eef7; width:200px;text-align:left">Employee Name</td>
<td>#Html.TextBoxFor(m => m.EmployeeDetail.name, new { #readonly = "ReadOnly", #class = "ReadOnly", style = "width:300px" })</td>
#Html.HiddenFor(m => m.EmployeeDetail.name)
</tr>
<tr>
<td style="background-color:#d2eef7;width:200px;text-align:left">Designation</td>
<td >
#Html.TextBoxFor(m => m.EmployeeDetail.designation, new { #readonly = "ReadOnly", #class = "ReadOnly", style="width:300px" })
</td>
</tr>
<tr>
<td style="background-color:#d2eef7;width:200px;text-align:left">Directorate</td>
<td>#Html.TextBoxFor(m => m.EmployeeDetail.directorate, new { #readonly = "ReadOnly", #class = "ReadOnly", style = "width:300px" })</td>
</tr>
</table>
<br /><hr />
#using (Html.BeginForm("Save", "AFLeaveBalance", FormMethod.Post))
{
<table id="tblCurrentYear">
<tr style="background-color:#d2eef7;color:Black;font-weight:200">
<td colspan="4">
#Html.Label("Year: " + DateTime.Now.Year.ToString())
</td>
</tr>
<tr style="background-color:#d2eef7;color:Black;">
<td>Leave Type</td>
<td>Leave Taken</td>
<td>Leave Balance</td>
<td>Leave Total</td>
</tr>
#*#for (int i = 0; i < Model.LeaveDetailsList.Count; i++)*#
#*{*#
<tr>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[0].LeaveType, new { #class = "ReadOnly", #readonly = "readonly", style = "width:80px; text-align:center" })</td>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[0].LeaveTaken, new { width = "100" })</td>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[0].LeaveBalance, new { width = "100" })</td>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[0].LeaveTotal, new { width = "100" })</td>
</tr>
<tr>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[1].LeaveType, new { #class = "ReadOnly", #readonly = "readonly", style = "width:80px; text-align:center" })</td>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[1].LeaveTaken, new { width = "100" })</td>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[1].LeaveBalance, new { width = "100" })</td>
<td>#Html.TextBoxFor(m => m.LeaveDetailsList[1].LeaveTotal, new { width = "100" })</td>
</tr>
#*}*#
</table>
<br />
<table style="border:none">
<tr>
<td style="width:600px;text-align:left;border:none">
<input id="btnSave" type="submit" value="Save" style="width:100px" />
</td>
</tr>
</table>
}
</div>

Answer 1

The simplest way is to store all you need in session on the server and then to populate all you need from that session after submit.