Display ASP.Net GridView selected row data in TextBoxes using C# and VB.Net

Hi ArunaAbi,

Please refer below sample.

HTML

CustomerId
<br />
<asp:TextBox ID="txtCustomerId" runat="server" ReadOnly="true"></asp:TextBox>
<br />
Name
<br />
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<br />
Country
<br />
<asp:TextBox ID="txtCountry" runat="server"></asp:TextBox>
<br />
<asp:Button ID="btnupdate" runat="server" Text="Update" OnClick="btnupdate_Click1" />
<br />
<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="CustomerId" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Button ID="Button1" Text="View" runat="server" OnClick="View" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

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

VB.Net

Imports System.Data.SqlClient
Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{

    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

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 btnupdate_Click1(object sender, EventArgs e)
{
    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", con))
        {
            con.Open();
            cmd.Parameters.AddWithValue("@Name", txtName.Text);
            cmd.Parameters.AddWithValue("@Country", txtCountry.Text);
            cmd.Parameters.AddWithValue("@CustomerId", txtCustomerId.Text);
            cmd.ExecuteNonQuery();
            con.Close();
            this.BindGrid();
        }
    }
}

protected void View(object sender, EventArgs e)
{
    Button btn = (Button)sender;
    GridViewRow row = (GridViewRow)btn.NamingContainer;
    txtCustomerId.Text = row.Cells[0].Text;
    txtName.Text = row.Cells[1].Text;
    txtCountry.Text = row.Cells[2].Text;
}

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 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 btnupdate_Click1(ByVal sender As Object, ByVal e As EventArgs)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand("UPDATE Customers SET Name = @Name, Country = @Country WHERE CustomerId = @CustomerId", con)
            con.Open()
            cmd.Parameters.AddWithValue("@Name", txtName.Text)
            cmd.Parameters.AddWithValue("@Country", txtCountry.Text)
            cmd.Parameters.AddWithValue("@CustomerId", txtCustomerId.Text)
            cmd.ExecuteNonQuery()
            con.Close()
            Me.BindGrid()
        End Using
    End Using
End Sub

Protected Sub View(ByVal sender As Object, ByVal e As EventArgs)
    Dim btn As Button = CType(sender, Button)
    Dim row As GridViewRow = CType(btn.NamingContainer, GridViewRow)
    txtCustomerId.Text = row.Cells(0).Text
    txtName.Text = row.Cells(1).Text
    txtCountry.Text = row.Cells(2).Text
End Sub

Screenshot