Hi arujvedia,

Change the jQuery selector for Insert, Edit, Update and Delete.

Please refer below sample.

For this sample i have used below article.

Insert Edit Update and Delete in ASP.Net GridView without PostBack in ASP.Net

Database

I have made use of the following table Customers with the schema as follows. 

I have already inserted few records in the table.

You can download the database table SQL by clicking the download link below.

Download SQL file

HTML

<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField HeaderText="Customer Id" ItemStyle-Width="110px" ItemStyle-CssClass="CustomerId">
            <ItemTemplate>
                <asp:Label Text='<%# Eval("CustomerId") %>' runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Name" ItemStyle-Width="150px" ItemStyle-CssClass="Name">
            <ItemTemplate>
                <asp:Label Text='<%# Eval("Name") %>' runat="server" />
                <asp:TextBox Text='<%# Eval("Name") %>' runat="server" Style="display: none" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Country" ItemStyle-Width="150px" ItemStyle-CssClass="Country">
            <ItemTemplate>
                <asp:Label Text='<%# Eval("Country") %>' runat="server" />
                <asp:TextBox Text='<%# Eval("Country") %>' runat="server" Style="display: none" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton Text="Edit" runat="server" CssClass="Edit" />
                <asp:LinkButton Text="Update" runat="server" CssClass="Update" Style="display: none" />
                <asp:LinkButton Text="Cancel" runat="server" CssClass="Cancel" Style="display: none" />
                <asp:LinkButton Text="Delete" runat="server" CssClass="Delete" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse">
    <tr>
        <td style="width: 150px">
            Name:<br />
            <asp:TextBox ID="txtName" runat="server" Width="140" />
        </td>
        <td style="width: 150px">
            Country:<br />
            <asp:TextBox ID="txtCountry" runat="server" Width="140" />
        </td>
        <td style="width: 100px">
            <br />
            <asp:Button ID="btnAdd" runat="server" Text="Add" />
        </td>
    </tr>
</table>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.6.1.min.js"
    integrity="sha256-o88AwQnZB+VDvE9tvIXrMQaPlFFSUTR+nldQm1LuPXQ=" crossorigin="anonymous"></script>
<script type="text/javascript">
    $(function () {
        $.ajax({
            type: "POST",
            url: "Default.aspx/GetCustomers",
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: OnSuccess
        });
    });

    function OnSuccess(response) {
        var xmlDoc = $.parseXML(response.d);
        var xml = $(xmlDoc);
        var customers = xml.find("Table");
        var row = $("[id*=gvCustomers] tr:last-child");
        if (customers.length > 0) {
            $.each(customers, function () {
                var customer = $(this);
                AppendRow(row, $(this).find("CustomerId").text(), $(this).find("Name").text(), $(this).find("Country").text())
                row = $("[id*=gvCustomers] tr:last-child").clone(true);
            });
        } else {
            row.find(".Edit").hide();
            row.find(".Delete").hide();
            row.find("span").html('&nbsp;');
        }
    }

    function AppendRow(row, customerId, name, country) {
        //Bind CustomerId.
        $(".CustomerId", row).find("span").html(customerId);

        //Bind Name.
        $(".Name", row).find("span").html(name);
        $(".Name", row).find("input").val(name);

        //Bind Country.
        $(".Country", row).find("span").html(country);
        $(".Country", row).find("input").val(country);

        row.find(".Edit").show();
        row.find(".Delete").show();
        $("[id*=gvCustomers]").append(row);
    }

//Add event handler.
$("[id*=btnAdd]").on("click", function () {
    var txtName = $("[id*=txtName]");
    var txtCountry = $("[id*=txtCountry]");
    $.ajax({
        type: "POST",
        url: "CS.aspx/InsertCustomer",
        data: '{name: "' + txtName.val() + '", country: "' + txtCountry.val() + '" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (response) {
            var row = $("[id*=gvCustomers] tr:last-child");
            if ($("[id*=gvCustomers] tr:last-child span").eq(0).html() != "&nbsp;") {
                row = row.clone();
            }
            AppendRow(row, response.d, txtName.val(), txtCountry.val());
            txtName.val("");
            txtCountry.val("");
        }
    });
    return false;
});

//Edit event handler.
$("[id*=gvCustomers] .Edit").on("click", function () {
    var row = $(this).closest("tr");
    $("td", row).each(function () {
        if ($(this).find("input").length > 0) {
            $(this).find("input").show();
            $(this).find("span").hide();
        }
    });
    row.find(".Update").show();
    row.find(".Cancel").show();
    row.find(".Delete").hide();
    $(this).hide();
    return false;
});

//Update event handler.
$("[id*=gvCustomers] .Update").on("click", function () {
    var row = $(this).closest("tr");
    $("td", row).each(function () {
        if ($(this).find("input").length > 0) {
            var span = $(this).find("span");
            var input = $(this).find("input");
            span.html(input.val());
            span.show();
            input.hide();
        }
    });
    row.find(".Edit").show();
    row.find(".Delete").show();
    row.find(".Cancel").hide();
    $(this).hide();

    var customerId = row.find(".CustomerId").find("span").html();
    var name = row.find(".Name").find("span").html();
    var country = row.find(".Country").find("span").html();
    $.ajax({
        type: "POST",
        url: "CS.aspx/UpdateCustomer",
        data: '{customerId: ' + customerId + ', name: "' + name + '", country: "' + country + '" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json"
    });

    return false;
});

//Cancel event handler.
$("[id*=gvCustomers] .Cancel").on("click", function () {
    var row = $(this).closest("tr");
    $("td", row).each(function () {
        if ($(this).find("input").length > 0) {
            var span = $(this).find("span");
            var input = $(this).find("input");
            input.val(span.html());
            span.show();
            input.hide();
        }
    });
    row.find(".Edit").show();
    row.find(".Delete").show();
    row.find(".Update").hide();
    $(this).hide();
    return false;
});

//Delete event handler.
$("[id*=gvCustomers] .Delete").on("click", function () {
    if (confirm("Do you want to delete this row?")) {
        var row = $(this).closest("tr");
        var customerId = row.find("span").html();
        $.ajax({
            type: "POST",
            url: "CS.aspx/DeleteCustomer",
            data: '{customerId: ' + customerId + '}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (response) {
                if ($("[id*=gvCustomers] tr").length > 2) {
                    row.remove();
                } else {
                    row.find(".Edit").hide();
                    row.find(".Delete").hide();
                    row.find("span").html('&nbsp;');
                }
            }
        });
    }

    return false;
});
</script>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.Services;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Imports System.Web.Services

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindDummyRow();
    }
}

private void BindDummyRow()
{
    DataTable dummy = new DataTable();
    dummy.Columns.Add("CustomerId");
    dummy.Columns.Add("Name");
    dummy.Columns.Add("Country");
    dummy.Rows.Add();
    gvCustomers.DataSource = dummy;
    gvCustomers.DataBind();
}

[WebMethod]
public static string GetCustomers()
{
    string query = "SELECT CustomerId, Name, Country FROM Customers";
    SqlCommand cmd = new SqlCommand(query);
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                sda.Fill(ds);
                return ds.GetXml();
            }
        }
    }
}

[WebMethod]
public static int InsertCustomer(string name, string country)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("INSERT INTO Customers VALUES(@Name, @Country) SELECT SCOPE_IDENTITY()"))
        {
            cmd.Parameters.AddWithValue("@Name", name);
            cmd.Parameters.AddWithValue("@Country", country);
            cmd.Connection = con;
            con.Open();
            int customerId = Convert.ToInt32(cmd.ExecuteScalar());
            con.Close();
            return customerId;
        }
    }
}

[WebMethod]
public static void UpdateCustomer(int customerId, string name, string country)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("UPDATE Customers SET Name = @Name, Country = @Country WHERE CustomerId = @CustomerId"))
        {
            cmd.Parameters.AddWithValue("@CustomerId", customerId);
            cmd.Parameters.AddWithValue("@Name", name);
            cmd.Parameters.AddWithValue("@Country", country);
            cmd.Connection = con;
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

[WebMethod]
public static void DeleteCustomer(int customerId)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("DELETE FROM Customers WHERE CustomerId = @CustomerId"))
        {
            cmd.Parameters.AddWithValue("@CustomerId", customerId);
            cmd.Connection = con;
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Me.BindDummyRow()
    End If
End Sub

Private Sub BindDummyRow()
    Dim dummy As New DataTable()
    dummy.Columns.Add("CustomerId")
    dummy.Columns.Add("Name")
    dummy.Columns.Add("Country")
    dummy.Rows.Add()
    gvCustomers.DataSource = dummy
    gvCustomers.DataBind()
End Sub

<WebMethod()>
Public Shared Function GetCustomers() As String
    Dim query As String = "SELECT CustomerId, Name, Country FROM Customers"
    Dim cmd As New SqlCommand(query)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As New SqlConnection(constr)
        Using sda As New SqlDataAdapter()
            cmd.Connection = con
            sda.SelectCommand = cmd
            Using ds As New DataSet()
                sda.Fill(ds)
                Return ds.GetXml()
            End Using
        End Using
    End Using
End Function

<WebMethod()>
Public Shared Function InsertCustomer(name As String, country As String) As Integer
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As New SqlConnection(constr)
        Using cmd As New SqlCommand("INSERT INTO Customers VALUES(@Name, @Country) SELECT SCOPE_IDENTITY()")
            cmd.Parameters.AddWithValue("@Name", name)
            cmd.Parameters.AddWithValue("@Country", country)
            cmd.Connection = con
            con.Open()
            Dim customerId As Integer = Convert.ToInt32(cmd.ExecuteScalar())
            con.Close()
            Return customerId
        End Using
    End Using
End Function

<WebMethod()>
Public Shared Sub UpdateCustomer(customerId As Integer, name As String, country As String)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As New SqlConnection(constr)
        Using cmd As New SqlCommand("UPDATE Customers SET Name = @Name, Country = @Country WHERE CustomerId = @CustomerId")
            cmd.Parameters.AddWithValue("@CustomerId", customerId)
            cmd.Parameters.AddWithValue("@Name", name)
            cmd.Parameters.AddWithValue("@Country", country)
            cmd.Connection = con
            con.Open()
            cmd.ExecuteNonQuery()
            con.Close()
        End Using
    End Using
End Sub

<WebMethod()>
Public Shared Sub DeleteCustomer(customerId As Integer)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As New SqlConnection(constr)
        Using cmd As New SqlCommand("DELETE FROM Customers WHERE CustomerId = @CustomerId")
            cmd.Parameters.AddWithValue("@CustomerId", customerId)
            cmd.Connection = con
            con.Open()
            cmd.ExecuteNonQuery()
            con.Close()
        End Using
    End Using
End Sub

Screenshot