gracias Ka0stj.
practicamente tengo esto .... pero tengo la duda de donde colocarlo...
Código PHP:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<appSettings>
  <add key="ConnectionString" value="data source = BJESUA-PC/SQLEXPRESS; initial catalog = IPC2; user id = bjesua-PC/bjesua;/>
  </appSettings>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<br />
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
<br />
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
<br />
<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</div>
</form>
</body>
</html>
y mi codigo
Código PHP:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data.Sql;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string connString = Convert.ToString(System.Configuration.ConfigurationManager.AppSettings["ConnectionString"]);
SqlConnection objConn;
objConn = new SqlConnection(connString);
 
try
{
  objConn.Open();
 
  // Tus rutinas
  SqlCommand myCommand = new SqlCommand("insert into usuario values ('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + TextBox4.Text + "','" + TextBox5.Text + "')", objConn);
myCommand.ExecuteNonQuery();
  objConn.Close();
}
catch (Exception ex)
{
throw ex;
}
}
}
gracias!.exitos.