Display first gridview row data in form

public partial class Flights : System.Web.UI.Page
{
    private string strcon = ConfigurationManager.ConnectionStrings["con"].ConnectionString;   
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            
            FillGrid();
            GridView1.SelectedIndex = 0;
        }     
    }
    protected void submit_Click(object sender, EventArgs e)
    {
        
        FlightDatabase.FlightProperties _flight = new FlightDatabase.FlightProperties();
        if (txtID.Text.Length > 0)
        {
            _flight.ID = Convert.ToInt32(txtID.Text);
        }
        _flight.AirName = txtAirname.Text;
        _flight.Departure = Convert.ToDateTime(txtDeparture.Text);
        _flight.Arrival = Convert.ToDateTime(txtArrival.Text);
        _flight.Duration = txtDuration.Text;
        _flight.Stops = Convert.ToInt32(txtStops.Text);
        _flight.Price = txtPrice.Text;
 
        Session["obj_Airlines"] = _flight;
 
        FlightDatabase.Flight _fl = new  FlightDatabase.Flight();
 
        int rowsAffected=0;
        if (txtID.Text.Length > 0)
        {
            _fl.updateRecords();
        }
        else
        {
            rowsAffected = _fl.insertRecords();
            
        }
 
        if (rowsAffected >= 1)
        {
            lblMsg.Text = "User Registration successful";
        }
        else
        {
            lblMsg.Text = "User Updated successfully";
        }
        GridView1.EditIndex = -1;
        FillGrid();     
    }
 

    private void FillGrid()
    {
        FlightDatabase.Flight _fl = new FlightDatabase.Flight();
        GridView1.DataSource = _fl.FillGrid();
        DataBind();
        _fl = null;
    }
 
    protected void gvw_SelectedIndexChanged(object sender, EventArgs e)
    {
        
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
 
        GridViewRow _row=GridView1.Rows[e.NewEditIndex];
        txtID.Text = GridView1.DataKeys[_row.RowIndex].Value.ToString();
        txtAirname.Text = _row.Cells[0].Text;
 
        TextBox textDeparts = (TextBox)_row.Cells[1].FindControl("Label3");
        txtDeparture.Text  = textDeparts.Text;
 
        txtArrival.Text = _row.Cells[2].Text;
        txtDuration.Text = _row.Cells[3].Text;
        
 
        //TextBox txt = (TextBox)this.GridView1.Rows[e.NewEditIndex].FindControl("TextBox1");

        DropDownList labelStops = (DropDownList)_row.Cells[4].FindControl("Label2");
        txtStops.Text = labelStops.Text;
 
        Label labelPrice = (Label)_row.Cells[5].FindControl("Label1");
            
        txtPrice.Text = labelPrice.Text;
 
    }
    
    protected void GridView1_RowUpdating1(object sender, GridViewUpdateEventArgs e)
    {
    }
    protected void txtPrice_TextChanged(object sender, EventArgs e)
    {
 
    }
 
    protected void GridView1_DataBound(object sender, EventArgs e)
    {
        foreach (GridViewRow txtStops in GridView1.Rows)
        {
            DropDownList labelStops = (DropDownList)txtStops.Cells[4].FindControl("Label2");
 
            if (int.Parse(labelStops.Text) > 0)
            {
                txtStops.BackColor = System.Drawing.Color.CornflowerBlue;
            }
        }
        foreach (GridViewRow txtPrice in GridView1.Rows)
        {
            Label labelPrice = (Label)txtPrice.Cells[5].FindControl("Label1");
 
            if (decimal.Parse(labelPrice.Text) > 1000)
            {
                txtPrice.BackColor = System.Drawing.Color.Gray;
            }
        }
    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        FillGrid();
    }
 
    protected void lbkSelect_Click(object sender, EventArgs e)
    {
        LinkButton btndetails = sender as LinkButton;
 
        GridViewRow gvrow = (GridViewRow)btndetails.NamingContainer;
 
        txtID.Text = GridView1.DataKeys[gvrow.RowIndex].Value.ToString();
        lblAirlineName.Text = gvrow.Cells[0].Text;
 
        TextBox textDeparts = (TextBox)gvrow.Cells[1].FindControl("Label3"); 
 
        lblDeparture.Text = textDeparts.Text;
 
        lblArrival.Text = gvrow.Cells[2].Text;
        lblDuration.Text = gvrow.Cells[3].Text;
 
        DropDownList labelStops = (DropDownList)gvrow.Cells[4].FindControl("Label2");
 
        lblStops.Text = labelStops.Text;
 
        Label labelPrice = (Label)gvrow.Cells[5].FindControl("Label1");
 
        lblPrice.Text = labelPrice.Text;
 
        ctlModalPopupExtender.Show();
    }   
}