title: Asp.net adding database from textbox and dropdownlist
body: <p>net to adding database. I am trying to do texts on two textbox and one selected value in dropdownlist to add my table.
  Here is my code</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  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 connectionString = @" Data Source=.\SQLEXPRESS;AttachDbFilename=C:\USERS\CEM\DOCUMENTS\VISUAL STUDIO 2010\WEBSITES\EKLEMEDENE\APP_DATA\DATABASE.MDF;Integrated Security=True;User Instance=True";
          string queryString = "INSERT INTO ekle(flight, name, food) VALUES   ('" + TextBox1.Text + " ' , '" + TextBox2.Text + " ' ,  '" + DropDownList1.SelectedValue + " '  )";
          SqlConnection con = new SqlConnection(connectionString);
          SqlCommand command = new SqlCommand(queryString, con);
          con.Open();
          command.ExecuteNonQuery();
  
          con.Close();
      }
  }
  </code></pre>
  
  <p>After I execute I will have error </p>
  
  <blockquote>
    <p>Database 'C:\Users\Cem\Documents\Visual Studio 2010\WebSites\eklemedene\App_Data\Database.mdf' already exists. Choose a different database name.
    An attempt to attach an auto-named database for file C:\USERS\CEM\DOCUMENTS\VISUAL STUDIO 2010\WEBSITES\EKLEMEDENE\APP_DATA\DATABASE.MDF failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.</p>
  </blockquote>