Display Gridview Selected Row in TextBox and RadioButtonList in ASP.Net

This way:

HTML:

<form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
            runat="server" AutoGenerateColumns="false" OnRowDataBound="OnRowDataBound" OnSelectedIndexChanged="OnSelectedIndexChanged">
            <Columns>
                <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="150" />
                <asp:BoundField DataField="Delivery" HeaderText="Delivery" ItemStyle-Width="150" />
                <asp:BoundField DataField="Type" HeaderText="Type" ItemStyle-Width="150" />
            </Columns>
        </asp:GridView>
        <br />
        <asp:TextBox ID="txtId" runat="server" /><br />
        <asp:TextBox ID="txtDelivery" runat="server" /><br />
        <asp:RadioButtonList ID="RadioButtonList1" runat="server">
            <asp:ListItem Text="Normal"></asp:ListItem>
            <asp:ListItem Text="Urgent"></asp:ListItem>
        </asp:RadioButtonList>
        <asp:LinkButton ID="lnkDummy" runat="server"></asp:LinkButton>
    </div>
    </form>

C#:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Delivery"), new DataColumn("Type") });
            dt.Rows.Add(1, "Prodcut1", "Normal");
            dt.Rows.Add(2, "Prodcut1", "Urgent");
            dt.Rows.Add(3, "Prodcut1", "Urgent");
            dt.Rows.Add(4, "Prodcut1", "Normal");
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }

    protected void OnRowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes["onclick"] = Page.ClientScript.GetPostBackClientHyperlink(GridView1, "Select$" + e.Row.RowIndex);
            e.Row.Attributes["style"] = "cursor:pointer";
        }
    }

    protected void OnSelectedIndexChanged(object sender, EventArgs e)
    {
        this.txtId.Text = GridView1.SelectedRow.Cells[0].Text;
        this.txtDelivery.Text = GridView1.SelectedRow.Cells[1].Text;
        this.RadioButtonList1.SelectedIndex = GridView1.SelectedRow.Cells[2].Text == "Normal" ? 0 : 1;
    }

Import:

using System.Data;

Add this in your page directive

EnableEventValidation="false"

Thank You.