hi.. need some help in c# classes

hi.. need some help in c# classes

i have an aspx.cs file which in it has a reference from my webconfig file for the connection to my sql server database... also in my aspx.cs file i have the Save functionality.

i would like to create a class which has a connection and also the save functionality then i call this class into my aspx.cs file. i have been reading and i am bit confused...why? cause i am new to c# .....

can someone tell me

the structure of the class.. meaning how i should code the class in order to achieve a class with functionality then call in into my aspx.cs file

if i create a class do i need to run the command prompt of vs.net in order to create the a dll, or is there another way to create a dll in order to call my class.

thanks in advance....

below is my code for which is in my aspx.cs file

Code:

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private void butSave_Click(object sender, System.EventArgs e)
                {
                        string constring;
                        SqlParameter paramReturn;
                        SqlCommand sqlcomm;
                        SqlConnection myconn;

                        constring = ConfigurationSettings.AppSettings["connstr"];

                        myconn = new SqlConnection( constring );
       
                        sqlcomm= new SqlCommand( "GroupsAdd", myconn);
                        sqlcomm.CommandType= CommandType.StoredProcedure;

                        paramReturn = sqlcomm.Parameters.Add("@return",SqlDbType.Int);
                        paramReturn.Direction = ParameterDirection.ReturnValue;

                        if (str != null)
                        {
                                sqlcomm.Parameters.Add( "@groupname" , str);
                        }
                        else
                        {
                                sqlcomm.Parameters.Add( "@groupname" , txtGroupName.Text);
                        }                       

                        myconn.Open();
                        sqlcomm.ExecuteNonQuery();
                        myconn.Close();

                        if((int)sqlcomm.Parameters["@Return"].Value == 0)
                          {
                                  lblMessage.Text = "GroupName has been saved";
                          }
                          else
                          {
                                  lblMessage.Text ="GroupName already exists";
                          }
                                                       

                }

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