Edit and Update ASP.Net GridView selected record on Button Click using C# and VB.Net

Hi Ganeshk670,

Please refer below sample.

HTML

<asp:Panel ID="pnlShowHide" runat="server">
    CustomerId :
    <asp:TextBox runat="server" ID="txtCustomerId" /><br />
    Name :
    <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
    <br />
    Country :
    <asp:TextBox runat="server" ID="txtCountry"></asp:TextBox>
    <br />
    <asp:Button Text="Update" runat="server" OnClick="Update" />
</asp:Panel>
<br />
<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false" OnSelectedIndexChanged="gvCustomers_SelectedIndexChanged">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="CustomerId" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:CommandField ShowSelectButton="True" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data.SqlClient;
using System.Data;
using System.Configuration;

VB.Net

Imports System.Data.SqlClient
Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        BindGrid();
        pnlShowHide.Visible = false;
    }
}

private void BindGrid()
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT CustomerId, Name,Country FROM Customers", con))
        {
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataTable dt = new DataTable();
                da.Fill(dt);
                gvCustomers.DataSource = dt;
                gvCustomers.DataBind();
            }
        }
    }
}

protected void gvCustomers_SelectedIndexChanged(object sender, EventArgs e)
{
    GridViewRow row = gvCustomers.SelectedRow;
    txtCustomerId.Text = row.Cells[0].Text;
    txtName.Text = row.Cells[1].Text;
    txtCountry.Text = row.Cells[2].Text;
    pnlShowHide.Visible = true;
}

protected void Update(object sender, EventArgs e)
{
    string query = "UPDATE Customers SET Name =@Name, Country =@Country WHERE CustomerId =@Id";
    UpdateData(query);
    BindGrid();
}

private void UpdateData(string query)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand(query, con))
        {
            cmd.Parameters.AddWithValue("@Id", txtCustomerId.Text);
            cmd.Parameters.AddWithValue("@Name", txtName.Text);
            cmd.Parameters.AddWithValue("@Country", txtCountry.Text);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        BindGrid()
        pnlShowHide.Visible = False
    End If
End Sub

Private Sub BindGrid()
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand("SELECT CustomerId, Name,Country FROM Customers", con)
            Using da As SqlDataAdapter = New SqlDataAdapter(cmd)
                Dim dt As DataTable = New DataTable()
                da.Fill(dt)
                gvCustomers.DataSource = dt
                gvCustomers.DataBind()
            End Using
        End Using
    End Using
End Sub

Protected Sub gvCustomers_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim row As GridViewRow = gvCustomers.SelectedRow
    txtCustomerId.Text = row.Cells(0).Text
    txtName.Text = row.Cells(1).Text
    txtCountry.Text = row.Cells(2).Text
    pnlShowHide.Visible = True
End Sub

Protected Sub Update(ByVal sender As Object, ByVal e As EventArgs)
    Dim query As String = "UPDATE Customers SET Name =@Name, Country =@Country WHERE CustomerId =@Id"
    UpdateData(query)
    BindGrid()
End Sub

Private Sub UpdateData(ByVal query As String)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand(query, con)
            cmd.Parameters.AddWithValue("@Id", txtCustomerId.Text)
            cmd.Parameters.AddWithValue("@Name", txtName.Text)
            cmd.Parameters.AddWithValue("@Country", txtCountry.Text)
            con.Open()
            cmd.ExecuteNonQuery()
            con.Close()
        End Using
    End Using
End Sub

Screenshot