public async Task<JsonResult> Add(){}
public async Task<JsonResult> Edit(){}
public async Task<JsonResult> Display(){}

public async Task<JsonResult> Add(){}
public async Task<JsonResult> Edit(){}
public async Task<JsonResult> Display(){}
public async Task<JsonResult> Update(){}

<table class="table">
    <thead>
    <tr>
      <th>First Name</th>
      <th>Last Name</th>
    </tr>
    </thead>
    <tbody>
    <tr>
        <td>Mark</td>
        <td>Otto</td>
    </tr>
    <tr>
        <td>Jacob</td>
        <td>Thornton</td>
    </tr>
   </tbody>

<table class="table">
    <thead>
    <tr>
      <th>First Name</th>
      <th>Last Name</th>
    </tr>
    </thead>
    <tbody>
    <tr>
        <td>Mark</td>
        <td>Otto</td>
    </tr>
    <tr>
        <td>Jacob</td>
        <td>Thornton</td>
    </tr>
   </tbody>
</table>

<button class="btn btn-primary">Update</button>