Add Column in ASP.Net GridView and save record in database using C# and VB.Net

Hi ashishk,

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

HTML

<asp:GridView runat="server" AutoGenerateColumns="false" ID="GridView1" DataKeyNames="Id">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:TextBox runat="server" ID="txtEmail" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<br />
<asp:Button Text="Save" runat="server" OnClick="Save" />

Namespaces

C#

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

VB.Net

Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        // Populate GridView from Database.
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] { 
                        new DataColumn("Id", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

protected void Save(object sender, EventArgs e)
{
    foreach (GridViewRow row in GridView1.Rows)
    {
        int id = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);
        string name = row.Cells[0].Text.Trim();
        string country = row.Cells[1].Text.Trim();
        string email = (row.FindControl("txtEmail") as TextBox).Text.Trim();
        Insert(id, name, country, email);
    }
}

private void Insert(int id, string name, string country, string email)
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(conString))
    {
        string query = "INSERT INTO Students (Id,Name,Country,Email) VALUES(@Id,@Name,@Country,@Email)";
        using (SqlCommand cmd = new SqlCommand(query))
        {
            cmd.Parameters.AddWithValue("@Id", id);
            cmd.Parameters.AddWithValue("@Name", name);
            cmd.Parameters.AddWithValue("@Country", country);
            cmd.Parameters.AddWithValue("@Email", email);
            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
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn() {New DataColumn("Id", GetType(Integer)), New DataColumn("Name", GetType(String)), New DataColumn("Country", GetType(String))})
        dt.Rows.Add(1, "John Hammond", "United States")
        dt.Rows.Add(2, "Mudassar Khan", "India")
        dt.Rows.Add(3, "Suzanne Mathews", "France")
        dt.Rows.Add(4, "Robert Schidner", "Russia")
        GridView1.DataSource = dt
        GridView1.DataBind()
    End If
End Sub

Protected Sub Save(ByVal sender As Object, ByVal e As EventArgs)
    For Each row As GridViewRow In GridView1.Rows
        Dim id As Integer = Convert.ToInt32(GridView1.DataKeys(row.RowIndex).Value)
        Dim name As String = row.Cells(0).Text.Trim()
        Dim country As String = row.Cells(1).Text.Trim()
        Dim email As String = (TryCast(row.FindControl("txtEmail"), TextBox)).Text.Trim()
        Insert(id, name, country, email)
    Next
End Sub

Private Sub Insert(ByVal id As Integer, ByVal name As String, ByVal country As String, ByVal email As String)
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString

    Using con As SqlConnection = New SqlConnection(conString)
        Dim query As String = "INSERT INTO Students (Id,Name,Country,Email) VALUES(@Id,@Name,@Country,@Email)"

        Using cmd As SqlCommand = New SqlCommand(query)
            cmd.Parameters.AddWithValue("@Id", id)
            cmd.Parameters.AddWithValue("@Name", name)
            cmd.Parameters.AddWithValue("@Country", country)
            cmd.Parameters.AddWithValue("@Email", email)
            con.Open()
            cmd.ExecuteNonQuery()
            con.Close()
        End Using
    End Using
End Sub

Screenshot