Save form data into Json file in folder (directory) in ASP.Net using C# and VB.Net

Hi 954111rohit,

Check this example. Now please take its reference and correct your code.

HTML

<table>
    <tr>
        <td>Id</td>
        <td>
            <asp:TextBox ID="txtId" runat="server" /></td>
    </tr>
    <tr>
        <td>Name</td>
        <td><asp:TextBox ID="txtName" runat="server" /></td>
    </tr>
    <tr>
        <td>Country</td>
        <td><asp:TextBox ID="txtCountry" runat="server" /></td>
    </tr>
    <tr>
        <td colspan="2">
            <asp:Button Text="Submit" runat="server" OnClick="OnSubmit" /></td>
    </tr>
</table>

Code

C#

protected void OnSubmit(object sender, EventArgs e)
{
    Customer customer = new Customer();
    customer.Id = Convert.ToInt32(txtId.Text);
    customer.Name = txtName.Text;
    customer.Country = txtCountry.Text;
    // Generate the json string.
    string json = Newtonsoft.Json.JsonConvert.SerializeObject(customer, Newtonsoft.Json.Formatting.Indented);
    // Write the json string to file.
    System.IO.File.WriteAllText(Server.MapPath("~/json.json"), json);
}

public class Customer
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Country { get; set; }
}

VB.Net

Protected Sub OnSubmit(ByVal sender As Object, ByVal e As EventArgs)
    Dim customer As Customer = New Customer()
    customer.Id = Convert.ToInt32(txtId.Text)
    customer.Name = txtName.Text
    customer.Country = txtCountry.Text
    ' Generate the json string.
    Dim json As String = Newtonsoft.Json.JsonConvert.SerializeObject(customer, Newtonsoft.Json.Formatting.Indented)
    ' Write the json string to file.
    IO.File.WriteAllText(Server.MapPath("~/json.json"), json)
End Sub

Public Class Customer
    Public Property Id As Integer
    Public Property Name As String
    Public Property Country As String
End Class

Generated Json file

{
  "Id": 1,
  "Name": "Mudassar Khan",
  "Country": "India"
}