how to access textbox value in controller.

Accessing textbox value in controller depends on the parameters your controller method will take.

Suppose your controller will take only one argument then you simply call it by redirecting to the Url of your controller's method name along with argument.

{Controller}/{Method Name}/{Argument}
Employee/Details/EmpID
Employee/Details/12

//controller method looks like
Public ActionResult Details(int EmployeeId)
{ ..... }

Or if your controller will take modal as parameter then prepare json object and pass it to the controller. Using it you can also pass multiple values to controller.

//Javascript code
var employee = { EmployeeId: 12,
                 EmployeeName: StartShining }
  
//Your modal class looks like
Public Class Employee 
{
 Public int EmployeeId { get; set; }
 Public string EmployeeName { get; set; }
}

//Your controller method looks like
Public ActionResult Details(Employee emp)
{ ..... }

HTH

Add this code in Aspx page
--------------------------------

First Name
<%: Html.TextBoxFor(m=>m.FirstName)%>
Last Name
<%: Html.TextBoxFor(m=>m.LastName)%>
<input type="Submit" value="Submit" />

Add this to Model

Public string FirstName{get; Set;};
Public string LastName{get; Set;};

In Controller u can access

.FirstName