Hi Kankon,
Please refer below Sample.
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:BoundField DataField="CustomerId" HeaderText="Customer Id" />
<asp:BoundField DataField="Name" HeaderText="Name" />
<asp:TemplateField HeaderText="Country">
<ItemTemplate>
<asp:DropDownList ID="ddlCountries" runat="server">
<asp:ListItem Text="" Value="0"></asp:ListItem>
<asp:ListItem Text="United States" Value="United States"></asp:ListItem>
<asp:ListItem Text="India" Value="India"></asp:ListItem>
<asp:ListItem Text="France" Value="France"></asp:ListItem>
<asp:ListItem Text="Russia" Value="Russia"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Button Text="Update" ID="btnUpdate" runat="server" OnClick="Update" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Namespaces
C#
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
VB.Net
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Code
C#
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
this.BindGrid();
}
}
private void BindGrid()
{
string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(conString))
{
using (SqlCommand cmd = new SqlCommand("SELECT CustomerId, Name From Customers", con))
{
cmd.CommandType = CommandType.Text;
con.Open();
this.gvCustomers.DataSource = cmd.ExecuteReader();
this.gvCustomers.DataBind();
con.Close();
}
}
}
protected void Update(object sender, EventArgs e)
{
GridViewRow gvRow = (sender as Button).NamingContainer as GridViewRow;
int id = int.Parse(gvRow.Cells[0].Text);
string country = (gvRow.FindControl("ddlCountries") as DropDownList).SelectedItem.Text;
string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(conString))
{
using (SqlCommand cmd = new SqlCommand("UPDATE Customers SET Country = @Country WHERE CustomerId = @Id", con))
{
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@Id", id);
if (!string.IsNullOrEmpty(country))
{
cmd.Parameters.AddWithValue("@Country", country);
}
else
{
cmd.Parameters.AddWithValue("@Country", DBNull.Value);
}
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
}
this.BindGrid();
}
VB.Net
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not Me.IsPostBack Then
Me.BindGrid()
End If
End Sub
Private Sub BindGrid()
Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Using con As SqlConnection = New SqlConnection(conString)
Using cmd As SqlCommand = New SqlCommand("SELECT CustomerId, Name From Customers", con)
cmd.CommandType = CommandType.Text
con.Open()
Me.gvCustomers.DataSource = cmd.ExecuteReader()
Me.gvCustomers.DataBind()
con.Close()
End Using
End Using
End Sub
Protected Sub Update(ByVal sender As Object, ByVal e As EventArgs)
Dim gvRow As GridViewRow = TryCast((TryCast(sender, Button)).NamingContainer, GridViewRow)
Dim id As Integer = Integer.Parse(gvRow.Cells(0).Text)
Dim country As String = (TryCast(gvRow.FindControl("ddlCountries"), DropDownList)).SelectedItem.Text
Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Using con As SqlConnection = New SqlConnection(conString)
Using cmd As SqlCommand = New SqlCommand("UPDATE Customers SET Country = @Country WHERE CustomerId = @Id", con)
cmd.CommandType = CommandType.Text
cmd.Parameters.AddWithValue("@Id", id)
If Not String.IsNullOrEmpty(country) Then
cmd.Parameters.AddWithValue("@Country", country)
Else
cmd.Parameters.AddWithValue("@Country", DBNull.Value)
End If
con.Open()
cmd.ExecuteNonQuery()
con.Close()
End Using
End Using
Me.BindGrid()
End Sub
Screenshot
Output
