ASP.net i have created web page using oracle db con, in that

Question

ASP.net i have created web page using oracle db con, using a button click am fetching some data's to textbox, then after that using a drop down onselectedindexchanged event aam clearing some of the textbox values, now i have to insert the data there in the window with out clearing in the textboxes and new texts in the textboxes whixh is cleared using ddl onselect event.

aspx page:

 <form id="form1" runat="server">

    <div runat="server" id ="mydiv">

    &nbsp;

               

        <br />      <asp:DropDownList runat="server" ID="ddlcon" 

        OnSelectedIndexChanged="ddlcons" AutoPostBack="true">

    <asp:ListItem Value="0" Text="Select"></asp:ListItem>

    <asp:ListItem Value="1" Text="Yes"></asp:ListItem>

    <asp:ListItem Value="2" Text="No"></asp:ListItem>

    </asp:DropDownList> 

   

            <br />

   

            <table style="width:100%;">

            <tr>

                <td>

        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

                </td>

                <td>

        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

                </td>

                <td>

                    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

                </td>

            </tr>

            <tr>

                <td>

    <asp:Button ID="btnora" runat="server" Text="Create" onclick="btnora_Click" />

                </td>

                <td>

        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="search" 

                        style="height: 26px" />

       

                </td>

                <td>

                    <asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="insert" />

       

                </td>

            </tr>

            <tr>

                <td>

                    &nbsp;</td>

                <td>

                    &nbsp;</td>

                <td>

                    &nbsp;</td>

            </tr>

        </table>    </div>

        </form>

code behind file:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.Configuration;

using System.Data;

using System.Data.OracleClient;

public partial class ora_con : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

       

    }

    protected void btnora_Click(object sender, EventArgs e)

    {

        try

        {

            //use your own userid,password and datasorce 

            string Constring;

            Constring = WebConfigurationManager.ConnectionStrings["QuickStarts Instance"].ConnectionString;

            OracleConnection con = new OracleConnection(Constring);

            con.Open();

            OracleCommand cmd = con.CreateCommand();

            cmd.CommandText = "CREATE TABLE con(id varchar2(20),name varchar2(50))"; // uid not null

            cmd.ExecuteNonQuery();

            Response.Write("<script>alert('Successfully Created..');</script>");

        }

        catch (Exception)

        {

            Response.Write("<script>alert('Not Created..');</script>");

        }

    }

    

    protected void Button2_Click(object sender, EventArgs e)

    {

        {

            string Constring, query;

            Constring = WebConfigurationManager.ConnectionStrings["QuickStarts Instance"].ConnectionString;

            OracleConnection con = new OracleConnection(Constring);

            con.Open();

            query = "SELECT name,id FROM con where id = '" + TextBox3.Text.Trim() + "'";

            OracleCommand command = new OracleCommand(query, con);

            OracleDataReader reader = command.ExecuteReader();

            reader.Read();

            TextBox2.Text = reader[0].ToString();

            TextBox1.Text = reader[1].ToString();

            reader.Close();

            con.Close();

        }

    }

    protected void ddlcons(object sender, EventArgs e)

    {

        if (ddlcon.SelectedValue.ToString() == "1")

        {

        

            TextBox2.Text = "";

          //  TextBox3.Text = "";

        }

        else

        {

            Console.WriteLine("No Changes");

        }

    }

    protected void Button3_Click(object sender, EventArgs e)

    {

        {

               string Constring;

            Constring = WebConfigurationManager.ConnectionStrings["QuickStarts Instance"].ConnectionString;

            OracleConnection con = new OracleConnection(Constring);

            con.Open();

            string str = "insert into con  (name) values ('" + TextBox2.Text + "')";// here without clearing id will appear that id also should be insert with this name.            

            OracleCommand cmd = new OracleCommand(str, con);

            cmd.ExecuteNonQuery();

          

            Response.Write("Inserted");

           

        }

    }

}