System.Data.SqlClient.SqlException: Incorrect syntax near '

Question

    SqlConnection con = new SqlConnection("Data Source=APPLE;Initial Catalog=sam;Integrated Security=True");

            SqlCommand cmd = new SqlCommand();

            cmd.Connection = con;

            con.Open();

            string str1 = "DELETE * FROM AU_Delete";

            cmd.CommandText = str1;

            cmd.ExecuteNonQuery();

            con.Close();

           

This is  my coding for delete button it's showing error : Exception Details: System.Data.SqlClient.SqlException: Incorrect syntax near '*'.

what is the problem in my coding?