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Hello to all of you.
I am creating a registration form with ASP.NET and C#. The "systems" 
works fine but i don't want to insert a "data" that already is written 
to the database.
I used this script:

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<script language=3D"C#" runat=3D"server">

    SqlConnection myConnection;

    protected void Page_Load(Object Src, EventArgs E)
    {
        myConnection =3D new 
SqlConnection("server=3Dlocalhost;database=3Ddok_db;Trusted_Connection=3D
yes");

       
    }

    public void Add_Click(Object sender, EventArgs E)
    {
       

        if (Page.IsValid)
        {

            String insertCmd =3D "insert into user_name 
(user_first_name, user_last_name) values (@FName, @LName)";

            SqlCommand myCommand =3D new SqlCommand(insertCmd, 
myConnection);

           
            myCommand.Parameters.Add(new SqlParameter("@FName", 
SqlDbType.NVarChar, 50));
            myCommand.Parameters["@FName"].Value =3D 
user_first_name.Value;

            myCommand.Parameters.Add(new SqlParameter("@LName", 
SqlDbType.NVarChar, 50));
            myCommand.Parameters["@LName"].Value =3D 
user_last_name.Value;
          
                    }

            }
   
</script>

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Well. The code above sends entries to user_first_name and user_last_name 
and stores them to the database dok_db.
I don't want to add entries with the same user last or first name. Does 
anybody of you know how to do it? Please help me.

Thank  you in advanced.