ERROR:The ConnectionString property has not been initialized

Question

I GET THE ERROR:

The ConnectionString property has not been initialized.

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

{

   // SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["EMPLOYEEConnectionString2"].ConnectionString);

    int intcount;

    SqlCommand cmd;

    string sqlstr;

    int count;

    String strConnString = ConfigurationManager.ConnectionStrings["EMPLOYEEConnectionString2"].ConnectionString;

    SqlConnection con = new SqlConnection();

    

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void btnSave_Click(object sender, EventArgs e)

    {

        SqlCommand cmd = new SqlCommand();

        cmd.CommandType = CommandType.StoredProcedure;

        cmd.CommandText = "JOINMAX";

        cmd.Parameters.Add("@NAME", SqlDbType.VarChar).Value = txtName.Text.Trim();

        cmd.Parameters.Add("@EMAIL", SqlDbType.VarChar).Value =txtEMAIL.Text.Trim();

        cmd.Parameters.Add("@PHONENO", SqlDbType.VarChar).Value =txtPHONE.Text.Trim();

        cmd.Parameters.Add("@ERROR", SqlDbType.Char, 500);

        cmd.Parameters["@ERROR"].Direction = ParameterDirection.Output;

       

        

        

        cmd.Connection = con;

        try

        {

            con.Open();

            cmd.ExecuteNonQuery();

              string message = (string)cmd.Parameters["@ERROR"].Value;

              Label1.Text = "Record inserted successfully";

        }

        catch (Exception ex)

        {

            throw ex;

        }

        finally

        {

            

            con.Close();

            con.Dispose();

        }